ML14177A726

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Probabilistic Risk Assessment (PRA) Summary Report - Information Previously Committed to Provide (TAC ME3334). Part 2 of 4
ML14177A726
Person / Time
Site: Watts Bar 
Issue date: 06/25/2014
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
References
MDN-000-999-2008-0151, Rev. 001
Download: ML14177A726 (161)
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Text

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 98

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

MAAP RUn ldentifier ssBo-o15 Models success path SSBO-015 ssBo-018 Models success path SSBO-018 ssBo-o19 Models success path SSBO-019 ssBo-023 Models success path SSBO-023 ssBo-026 Models success path 5580-026 ssBo-028 Models success path SSBO-028 ssBo-032 Models success path SSBO-032 ssBo-035 Models success path SSBO-035 SteadyState steady state case verified that the parameter file was running as expected TLOF-A Models success path GTRAN-005, GTRAN-012 TLOF-B Models success path GTRAN-002, GTRAN-009 TLOF-C High pressure recirculation times Note: ldentifier preface "L2" refers to MAAP runs performed for the Level 2 Analysis.

Reference 43, Tables 4-2,7-2 through 7-10.

Reference 40, Tables 5-4, 5-6, 5-8, 5-9, 5-13,6-22,6-26,6-29,6-33, 6-37, and 6-39.

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 99

Subject:

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SUMMARY

Tim6rbreDwith 21 spm / pump leak Time to CD with 182 spm / pump leak Open 1 SG PORV at 30 minutes, Batteries lost at 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> (TD AFW =

200 qpm) 26.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> 17.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> 6.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Open 1 SG PORV at 30 minutes, Batteries lost at I hours (TD AFW =

150 qpm) 44 hours5.092593e-4 days <br />0.0122 hours <br />7.275132e-5 weeks <br />1.6742e-5 months <br /> 29.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 6.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> TD AFW = 240 gpm, Batteries lost at 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 10.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 4.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> TD AFW = 150 gpm, Batteries lost at 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 15.88 hours0.00102 days <br />0.0244 hours <br />1.455026e-4 weeks <br />3.3484e-5 months <br /> 4.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> Without TD AFW 2.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> 2.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 1.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> Reference 43, Table 7-11 21 0.79 182 0.2075 480 0.0025 Reference 43, Table 7-25

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page: 100

Subject:

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SUMMARY

Wlth C6ntainment $pray MLOCA S 35 min MLOCA A 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> MLOCA T 39 min MLOCA B 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> MLOCA U 35 min MLOCA C 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> MLOCA R 39 min MLOCA D 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> SLOCA T 38 min SLOCA A 15.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> SLOCA U 2.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> SLOCA B N/A (+24 hours)

SLOCA V 39 min SLOCA C 14.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> SLOCA W 3.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> SLOCA D N/A (+24 hours)

Reference 43, Tables 7 -16,7 -20 Ullth Contalnment Spnay MLOCA H 69m n MLOCA P 16.8 hr.

MLOCA K 65m n.

MLOCA O 6.8 hr.

MLOCA M 65m n.

MLOCA G 6.7 hr.

MLOCA N 69m n.

MLOCA E 18.5 hr.

SLOCA GCS 2.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> SLOCA G 34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br /> SLOCA HCS 4.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> SLOCA H 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> SLOCA ECS 1.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> SLOCA E 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> SLOCA FCS 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> SLOCA F N/A ft24 hours)

SLOCA MCS N/A ft24 hours)

SLOCA M N/A ft24 hours)

SLOCA NCS 41 min SLOCA N 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> Reference 43, Tables 7 -17, 7 -21

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 101

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SUMMARY

Table 28 -- HRA Support Timings HRA Action lnitiator Gue Informatlon lrreversible Damase Gue T"r.-

(ReferenGEl

,trrevensi,ble Damage

.Flsw AFWOPl MLOCA with high pressure Sl failed RCS cooldown and depressurization 26 min Section 7.3.2 CD due to inventory loss 100 min AFWOP2 SLOCA with high pressure SI failed RCS cooldown and depressurization Note 1 CD due to inventory loss 74 mtn AFWOP3 SLOCA with HPR failed Failure of automatic switchover to containment sump recirculation 27 min Section 7.3.3 CD due to inventory loss 97 min AFWOP5 SGTR Depressurize SG given successfu I identification and isolation of the ruptured SG Note 1 CD due to inventory loss 8.0 hr HAAFl LOSP Loss of Shutdown Boards 0

Scenario definition is SBO at time zero.

CD due to secondary side loss 1.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> HAAF2 SLOCA CST unavailable for AFW makeup Note 1 CD due to unavailable AFW CST depleted in 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> CD occurs at 18.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> HACDl TLOFW AFW fails and attempt to recover MFW 0

The TLOFW initiating event occurs at time zero.

CD due to unavailable MFWAFW and failed bleed and feed 1.42 hr

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 102

Subject:

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SUMMARY

Table 28 -- HRA Support Timings HRA Action lnitiator Gue Information lrrevensible Damage Cue Ta**

(Referenml lrrevereible Damaqe Tsw HAFRl GTRAN Loss of PCA Note 1 CD due to CST depletion CST depleted in 10.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> CD occurs at 14.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> HAISl ISLOCA ISLOCA initiator Note 1 CD due RWST depletion 1 1.9 hr HAMUl SGTR Low RWST level (27%)

13.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> ZWRWST HAMU1.d31 CD due to unavailable inventory control RWST depleted in 18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> CD occurs at 37.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> HAMU2 ISLOCA Low RWST level (27%)

t hour ZWRWST HAMU2.d88 CD due to unavailable RWST inventory RWST depleted in 1.34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br /> CD occurs at 2.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> HAMU3 GTRAN Low CST level Note 1 CD due to unavailable AFW CST depleted in 10.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> CD occurs at 14.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> HAMU4 SLOCA Low RWST level (27o/o) 30 minutes sLocA_1.d31 CD due to inventory loss 101 minutes HAOBl TLOFW 260/o WR of SG 15 minutes Table 7 -28 (CCP available)

CD due to failure of bleed and feed 30 minutes

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 103

Subject:

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SUMMARY

Table 28 -- HRA Support Timings HRA Action lnltiator Gue Informatlon lrreversible Damase Gue

Taom, (Referencel lrrevensible Damage

-!sw HAOB2 TLOFW 26% WR of SG 15 minutes Table 7 -28 (SI pump available)

CD due to failure of bleed and feed 30 minutes HAOFl TLOFW AFW fails and attempt to recover MFW Note 1 CD due to failure of AFW and MFW recoveries 1.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> HAOF2 TLOFW AFW fails and attempt to recover MFW Note 1 CD due to failure of AFW and MFW recoveries 1.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> HAOSl LLOCA ESFAS fails Note 1 CD due to inventory loss 6.9 minutes HAOS2 SLOCA ESFAS fails Note 1 CD due to inventory loss 1.24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> HAOS3 GTRAN AFW fails to automatically initiate Note 1 CD due to unavailable AFW 1.73 hours8.449074e-4 days <br />0.0203 hours <br />1.207011e-4 weeks <br />2.77765e-5 months <br /> HAPRl GTRAN Pressunzer PORV open Note 1 lf the operator closes the pressurizer PORV within 1.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, core uncoverv is prevented.

1.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> HARDl SGTR RCS conditions support RHR shutdown cooling t hour To maintain core cooling, RHR shutdown starts approxi mately t hour after the SGTR occurs.

CD due to unavailable shutdown cooling 28.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> HARHl LLOCA LLOCA 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> Three hours has past since the initiating event and switchover to containment sump is complete. (Section 2.0, Reference 9 Boron buildup preventing core cooling 4.177 hours0.00205 days <br />0.0492 hours <br />2.926587e-4 weeks <br />6.73485e-5 months <br /> HARLl LLOCA Auto swapover failure during LLOCA 16 minutes Section 7.3.1 (This is the limiting case.)

RWST depletion causes pump cavitation.

24.5 minutes

Calculation No. M DN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page: 104

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SUMMARY

HRA Action lnitiator

'Gue lnformation lrreversible Damage Cue Trkt nr (ReferGnce) lrrevercible Damase Tsw HARRl MLOCA RWST level less than 34o/o 26 minutes Section 7.3.2 RWST depletion causes pump cavitation.

38 minutes HASLl/HASL3 SGTR Successful identifi cation and isolation of the ruptured SG Note 1 CD due to inventory

!oss 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> HASL4 Secondary Side Break Secondary Side Break Note 1 Continual blowdown of faulted SG and CD occurs without CST refill.

17.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> HTPRl SBO TD AFW fails during an SBO 0

TD AFW should automatically start from SBO conditions CD due to unavailable AFW 1.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> RSIOP SSB!/SSBO CST depleted 8.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> IEVNT(191) is true.

SSBI-005.sum CD due to failed Sl re-initiation.

18 hours2.083333e-4 days <br />0.005 hours <br />2.97619e-5 weeks <br />6.849e-6 months <br /> SSIOP SGTR Pressurizer level high (92o/o span) 10.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> zPwz (> 48.6 ft) ssBr-010.d31 Pressurizer PORV fails to reseat because of water challenqe 1 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> Note 1: Cue is not available via MAAP 4.0.5. The cue is identified in some other plant specific documentation and is included in the HRA.

Note 2: Reference sections pertain to Reference 43 Reference 43, Table 8-1

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 105

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SUMMARY

System Notebook Auxiliary Feedwater System M D N-000-003-2008- 01 24 Component Cooling System M D N -000-070-2008- 0 1 32 Condensate and Feedwater System M D N -000-002-2008- 0 1 23 Containment Spray System M D N-0 00-07 2-2008-0 1 33 Containment Systems M D N-000-999-2008-0 1 39 Chemical and Volume Control System M D N -000-062-2008- 01 27 Electric Power System M D N -000-999-2008- 0 1 37 Electric Power Recovery M D N-000-999-2008-0 1 38 Essential Raw Cooling Water System M DN-000-067-2008-0 1 30 Engineered Safety Features Actuation System M D N-000-099-2008-0 1 36 Main Steam System M D N-000-00 1 -2008 -01 22 Plant Compressed Air System M D N -000-032-2008- 0 1 26 Pressurizer Power-Operated Relief Valves and Safety Valves M DN-000-068-2008-0 1 3 1 RCP Seal Injection and Thermal Barrier Cooling M D N -000-062-2008- 0 1 28 Reactor Protection System M DN-000-099-2008-0 1 35 Residual Heat Removal System M DN-000-074-2008-0 1 34 Safety Injection System M D N -000-063-2 008- 0 1 29 Steam Generator lsolation M D N -000-003-2008- 0 1 25

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 106

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SUMMARY

Type Code Deecription Prior Posterior Distribution iilean EF ExposEre Rate EF AOCFC AIR OPERATED VALVE FAILS TO CLOSE (CLEAN WATER) 1.11E-03 4.3 4

8749 5.09E-04 2.04 AOCFO AIR OPERATED VALVE FAILS TO OPEN (CLEAN WATER) 1.11E-03 4.3 0

8703 8.83E-05 4.30 AOCSO AIR OPERATED VALVES SPURIOUS oPERATTON (CLEAN WATER) 1.82E-07 18.80 0

1195740 3.02E-08 18.80 DDPFD DIESEL DRIVEN PUMP (STANDBY) FAILS TO START OR DURING FIRST HOUR OF OPERATION 5.54E-03 3.39 DDPFR DIESEL DRIVEN PUMP (STANDBY) FAILS TO RUN AFTER FIRST HOUR 9.48E-05 18.8 DGGFD DIESEL GENERATOR FAILS TO START OR DURING FIRST HOUR OF OPERATION 7.43E-03 2.75 5

711 7.15E-03 1.81 DGGFR DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR 8.48E-04 2.8 0

1s82 5.16E-04 2.80 MOCRP MOTOR OPERATED VALVE RUPTURE oR LEAK TNTERNAL < 50 GPM (CLEAN WATER) 1.67E-07 10.2 1

37751 08 2.45E-07 3.66 MOCSO MOTOR OPERATED VALVE SPURIOUS oPERATTON (CLEAN WATER) 4.45E-08 8.4 0

37751 08 2.58E-08 8.40

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 107

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SUMMARY

Type Gode Mean EF

'Failurcs Rate

,EF DGGFD DIESEL GENERATOR FAILS TO START OR DURING FIRST HOUR OF OPERATION 7.43E-03 2.75 5

711 7.15E-03 1.81 DGGFR DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR 8.48E-04 2.8 0

1582 5.16E-04 2.80 MOCXC MOTOR OPERATED VALVE TRANSFER cLosED (CLEAN WATER) 4.50E-08 8.40 0

2403958 2.82E-08 8.40 MOCXO MOTOR OPERATED VALVE TRANSFERS OPEN (CLEAN WATER) 4.45E-08 8.40 MORFC MOTOR OPERATED VALVE FAILS TO CLOSE (RAW WATER) 1.07E-03 3.6 0

1 158 5.26E-04 3.60 MORFO MOTOR OPERATED VALVE FAILS TO oPEN (RAW WATER) 1.07E-03 3.6 1

1 146 9.70E-04 2.74 MORRP MOTOR OPERATED VALVE RUPTURE oR LEAK TNTERNAL < 50 GPM (RAW WATER) 1.67E-07 10.2 0

644534 9.93E-08 10.20 MORXC MOTOR OPERATED VALVE TRANSFERS CLOSED (RAW WATER) 4.45E-08 8.40 PCBFD CONDENSATE BOOSTER PUMP FAILS ON DEMAND 2.23E-03 4.80 0

93 1.70E-03 4.80 PCBFD CONDENSATE BOOSTER PUMP FAILS ON DEMAND 2.23E-03 4.8 0

132 1.55E-03 4.80 PCBFR CONDENSATE BOOSTER PUMP FAILS DURING OPERATION 4.54E-06 3.1 0

100432 3.56E-06 3.10

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 108

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SUMMARY

Rates Type Gode Descriplion Plant Speclflc Data EF Failurcs Rate EF PCCFD CENTRIFUGAL CHARGING PUMP FAILS TO START ON DEMAND 2.23E-03 4.8 0

397 9.61E-04 4.81 PCCFR CENTRIFUGAL CHARGING PUMP FAILS DURING OPERATION 4.54E-06 3.1 0

87400 3.66E-06 3.10 PCOFD COMPONENT COOLING WATER PUMP FAILS ON DEMAND 2.23E-03 4.8 0

326 1.07E-03 4.81 PCOFR COMPONENT COOLING WATER PUMP FAILS DURING OPERATION 4.54E-06 3.1 0

93603 3.61E-06 3.10 PCSFl CONTAINMENT SPRAY PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.86E-03 3.35 2

181 3.65E-03 2.30 PCSFR CONTAINMENT SPRAY PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 5.80E-06 8.40 PCWFD CONDENSER COOLING WATER PUMP FAILS ON DEMAND 2.23E-03 4.8 0

109 1.64E-03 4.80 PCWFR CONDENSER COOLING WATER PUMP FAILS DURING OPERATION 4.54E-06 3.1 0

306260 2.47E-06 3.10 PMAFl MOTOR DRIVEN AUX. FEEDWATER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.86E-03 3.35 0

537 1.08E-03 3.35 PMAFR MOTOR DRIVEN AUXILIARY FEEDWATER PUMP FAILS DURING oPERATTON (AFTER FIRST HOUR) 5.80E-06 8.4 0

3457 5.34E-06 8.40

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 109

Subject:

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SUMMARY

Type Code Descrifiion f,ilean EF Failuree Rate EF PMOFD STANDBY MOTOR DRIVEN MAIN FEEDWATER PUMP FAILS TO START 1.86E-03 3.35 1

67 2.93E-03 2.64 PMOFR STANDBY MOTOR DRIVEN MAIN FEEDWATER PUMP FAILS TO RUN 5.80E-06 8.4 0

27881 3.41 E-06 8.40 POBFl BORIC ACID TRANSFER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.86E-03 3.35 0

61 10 2.03E-04 3.35 POBFR BORIC ACID PUMP FAILS DURING oPERATTON (AFTER FIRST HOUR) 5.80E-06 8.4 0

167 1 09 1.12E-O6 8.40 POEFD ESSENTIAL RAW COOLING WATER PUMP FAILS TO START ON DEMAND 2.23E-03 4.8 1

1612 8.73E-04 3.08 POEFR ESSENTIAL RAW COOLING WATER PUMP FAILS DURING OPERATION 4.54E-06 3.1 2

260468 5.85E-06 2.25 POHFD HOTWELL PUMP FAILS TO START ON DEMAND 2.23E-03 4.8 0

113 1.62E-03 4.80 POHFR HOTWELL PUMP FAILS DURING OPERATION 4.54E-06 3.1 0

112642 3.47E-06 3.10 PSRFl RESIDUAL HEAT REMOVAL PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.86E-03 3.35 0

482 1.1 3E-03 3.35 PSRFR RESIDUAL HEAT REMOVAL PUMP FAILS DURTNG OPERATTON (AFTER FTRST HOUR) 5.80E-06 8.4 0

5357 5.1 1 E-06 8.40

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 1 10

Subject:

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SUMMARY

Table 30 - Component Failure,Rates Type Gode Description Prlor Distribution Plaht Specific Dah Posterior Distribution f,iean EF Fallules Expoeure Rate EF PSSFl SAFETY INJECTION PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.86E-03 3.35 1

413 2.06E-03 2.64 PSSFR SAFETY INJECTION PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 5.80E-06 8.40 PTSFl TURBINE DRIVEN AUXILIARY FEEDWATER PUMP FAILS DURING oPERATTON (FTRST HOUR) 9.38E-03 4.56 3

279 1.05E-02 2.23 PTSFR TURBINE DRIVEN AUXILIARY FEEDWATER PUMP FAILS DURING oPERATTON (AFTER FIRST HOUR) 7.35E-05 8.40 Reference 38, Tables 5.1-1, 5. 1-2, 5.3. 1-2, 5.3.2-1, and 5.3.2-2

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SUMMARY

Type Gode CAFTARO Distribution EF l[iean EF CHRFD RUNNING CHILLER FAILS TO START ON DEMAND 9.83E-03 5.00 3.26E-03 1.9 CHRFR RUNNING CHILLER FAILS DURING OPERATION 9.42E-05 8.70 1.50E-04 2

DGGFD DIESEL GENERATOR FAILS TO START OR DURING FIRST HOUR OF OPERATION 7.15E-03 1.81 9.09E-03 2.58 DGGFR DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR 5.16E-04 2.80 6.09E-04 2.8 PCCFD CENTRIFUGAL CHARGING PUMP FAILS TO START ON DEMAND 9.61E-04 4.81 1.33E-03 4.81 PCCFR CENTRIFUGAL CHARGING PUMP FAILS DURING OPERATION 3.66E-06 3.10 4.05E-06 3.1 PCOFR COMPONENT COOLING WATER PUMP FAILS DURING OPERATION 3.61E-06 3.10 3.28E-06 3.1 PCSFl CONTAINMENT SPRAY PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 3.65E-03 2.30 8.30E-03 2.17 PCSFR CONTAINMENT SPRAY PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 5.78E-06 8.40 5.80E-06 8.4 PMAFl MOTOR DRIVEN AUX. FEEDWATER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.08E-03 3.35 5.77E-03 2.17 PMAFR MOTOR DRIVEN AUXILIARY FEEDWATER PUMP FAILS DURING oPERATTON (AFTER FIRST HOUR) 5.34E-06 8.40 5.80E-06 8.4 POEFD ESSENTIAL RAW COOLING WATER PUMP FAILS TO START ON DEMAND 8.73E-04 3.08 5.97E-04 4.81 POEFR ESSENTIAL RAW COOLING WATER PUMP FAILS DURING OPERATION 5.85E-06 2.25 3.40E-06 3.1

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SUMMARY

Table 31 - Component Failure Rete Gomparison Type Gode GAFTA Rl Distribution CAFTA RO Distribution EF, illean EF PSRFl RESIDUAL HEAT REMOVAL PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 1.13E-03 3.35 3.17E-03 2.84 PSRFR RESIDUAL HEAT REMOVAL PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 5.11E-06 8.40 5.80E-06 8.4 PSSFl SAFETY INJECTION PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 2.06E-03 2.64 5.05E-03 2.41 PSSFR SAFETY INJECTION PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 5.76E-06 8.40 5.80E-06 8.4

Reference:

CAFTA R0 values taken from R0 Data Notebook Tables 5.1-1 and 5.3.2-1

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Table 32 ;' Unavailabiltty Results Variable Name Description Total Hours Total Houns Unavailable Total Events

[iean 5th oloi ltiledian 95th %

EF IMTM PMAA AFW pump train A unavailable due to maintenance 6747s 240.8 16 3,93E-03 2.05E-03 3.58E-03 5.62E-03 1.8 ITTM-PMAA AFW pump train A unavailable due to testing 67475 8.9 5

1.82E-04 5.10E-05 1.45E-04 4.28E-04 2,9

!MTM-PMAB AFW pump train B unavailable due to maintenance 67475 4L4 30 6.45E-03 4.08E-03 6.24E-03 9.56E-03 1.53 ITTM-PMAB AFW pump train B unavailable due to testing 67475 8.6 19 1.38E-04 7.67E-O5 1.31E-04 2.25E-O4 L.7L IMTM PTO AFW pump train C unavailable due to maintenance 67330 663.1 42 L,O2E-02 6.95E-03 9.97E-03 L.43E-02 L.43

!TTM-PTO AFW pump train C unavailable due to testing 67330 44 40 6.79E-O4 4.58E-04 6.62E-A4 9.57E-O4 1.45

!MTM-PCOI CCS train A unavailable due to maintenance 7L425 47.5 2L 7.L5E-44 4.09E-04 5.81E-04 1.13E-03 L.67

!TTM-PCOA CCS train A unavailable due to testing 7L425 LO.4 44 1.50E-04 1.03E-04 L.47E-O4 2.09E-04 L.42

!MTM-PCO2 CCS train B unavailable due to maintenance 707L7 47.4 L7 7.33E-04 3.91E-04 6.90E-04 L.22E-O3 L.76 ITTM PCOB CCS train B unavailable due to testing 707L7 29.8 50 432E-O4 3.L4E-O4 4.25E-04 5.74E-04 1.35 IMTM PCO1A CCS Pump 1A unavailable due to maintenance 61849 40.5 7

8.18E-04 2.89E-04 7.44E-O4 L.73E-03 2.44

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 114

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SUMMARY

Variable Name Description Total Houns Tqtal Events illean sth %

Ittedian 95th o/o EF

!MTM-PCO18 CCS Pump 18 unavailable due to maintenance 51849 84.4 11 1.57E-03 7.05E-04 L.43E-03 2.91E-03 2.O3 IMTM PCOCS CCS Pump C-S unavailable due to maintenance 6LL4L L7L.5 L2 3.19E-03 1.49E-03 2.93E-03 5.77E-O3 L.97 IMTM PCSA CSS train A unavailable due to maintenance 67327 410.9 31 6.41E-03 4.08E-03 5.20E-03 9.44E-03 L.52 ITTM PCSA CSS train A unavailable due to testing 67327 L26.5 44 1.94E-03 1.34E-03 1.90E-03 2.70E-03 L.42

!MTM-PCSB CSS train B unavailable due to maintenance s4499 4L3 22 8.12E-03 4.71E-03 7.75E-O3 L.28E-02 1.65 ITTM PCSB CSS train B unavailable due to testing 54499 90.1 33 t.73E-03 1.12E-03 1.68E-03 2.52E-03 1.5 IMTM PCCA CVCS train A unavailable due to maintenance 672L3 283.8 22 4.52E-03 2.63E-03 4.32E-03 7.11E-03 1.55

!TTM-PCCA CVCS train A unavailable due to testing 672L3 16.9 31 2.64E-O4 1.68E-04 2.55E-04 3.89E-04 L.52 IMTM PCCB CVCS train B unavailable due to maintenance 67283 178.5 L4 2.95E-03 L.47E-O3 2.75E-03 5.15E-03 L.87

!TTM-PCCB CVCS train B unavailable due to testing 67283 27.4 LL 4.58E-04 2.LOE-O4 4.26E-O4 8.67E-O4 2.03

!MTM-POEA ERCW train A unavailable due to maintenance 69618 16.1 3

4.05E-04 5.99E-05 2.75E-04 1.14E-03 4.03

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 1 1 5

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SUMMARY

Table 32 -- Unavailability Results Variable Name Description Tota!

Hours Total Houns Unavallable Total Evente lllean sth %

Median 95th o/o EF

!TTM-POEA ERCW train A unavailable due to testing 69618 0

1

!MTM-POEB ERCW train B unavailable due to maintenance 59594 5.9 2

2.LLE-04 2.03E-05 1.09E-04 5.61E-04 5,7 ITTM POEB ERCW train B unavailable due to testing 69594 0

0 IMTM POEAA ERCW Pump A unavailable due to maintenance 60114 4418.8 20 7s3E-O2 4.47E-Oa 7.54E-O2 L.27E-OL 1.69 IMTM POEBA ERCW Pump B unavailable due to maintenance 60114 L576.7 19 2.84E-O2 1.58E-02 2.69E-O2 4.61E-02 L.7L

!MTM-POECA ERCW Pump C unavailable due to maintenance 60LL4 2963.L 19 5.34E-02 2.96E-O2 5.06E-02 8.65E-02 L.7L

!MTM-POEDA ERCW Pump D unavailable due to maintenance 60114 L429.6 19 2.58E-02 L.43E-O2 2.44E-O2 4.L8E-O2 L.7L IMTM POEEB ERCW Pump E unavailable due to maintenance 50114 L4OL,7 19 2.53E-02 1.40E-02 2.39E-O2 4.10E-02 L.7L

!MTM-POEFB ERCW Pump F unavailable due to maintenance 60114 L222.6 13 2.29E-O2 1.10E-02 2.LLE-O}

4.05E-02 L.92 IMTM POEGB ERCW Pump G unavailable due to maintenance 60114 1982.5 L7 3.61E-02 1.93E-02 3.40E-02 6.00E-02 L.76

!MTM-POEHB ERCW Pump H unavailable due to maintenance 60114 1038.9 r5 1.90E-02 9.94E-03 L.78E-O2 3.2LE-O2 1.8

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SUMMARY

Table 32 -- Unavailabiliry Results Variable Name Description Total Hours Total Hounr Unavailable Total Evente 5th o/o Median 95th o/o EF

!MTM-PSRA RHR train A unavailable due to maintenance 70208 324.7 31 4.85E-03 3.09E-03 4.70E-03 7.15E-03 L.52 ITTM PSRA RHR train A unavailable due to testing 70208 89.9 95 1.30E-03 1.02E-03 1.29E-03 1.63E-03 L.27

!MTM-PSRB RHR train B unavailable due to maintenance 70275 L87.2 L4 2.97E-O3 1.48E-03 2.76E-O3 5.17E-03 t.87 ITTM PSRB RHR train B unavailable due to testing 70275 LL3.7 94 1.54E-03 1.28E-03 1.63E-03 2.O7E-O3 L.27 IMTM PSSA SIS train A unavailable due to maintenance 67279 230.2 T7 3.74E-O3 2.00E-03 3.52E-03 6.22E-O3 L.76

!TTM-PSSA SIS train A unavailable due to testing 67279 36.2 83 5.48E-04 4.L9E-O4 5.41E-04 6.99E-04 L.29 IMTM PSSB SIS train B unavailable due to maintenance 673L9 202 L7 3.28E-03 1.75E-03 3.09E-03 5.46E-03 L.76

!TTM-PSSB SIS train B unavailable due to testing 673L9 36 89 5.44E-O4 4.20E-44 5.38E-04 5.89E-04 L.28 IMTM DDG1A EDG 1A unavailable due to maintenance 59913 783 74 L.L4E-O2 8.60E-03 1.13E-Oz L.48E-O2 L.31

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SUMMARY

Ta,ble St,-- Unavailability Results Variahle Hame Description Total

Events Itiean 5th olo '

Itiledian EF ITTM-DDG1A EDG 1A unavailable due to testing 69913 9.8 29 1.48E-04 9.27E-O5 L.43E-04 2.2LE-O4 L.54

!MTM-DDG18 EDG 18 unavailable due to maintenance 70282 848.1 67 r.23E-O2 9.15E-03 L.22E-O2 L.62E-02 1.33 ITTM DDG1B EDG 18 unavailable due to testing 70282 10.8 25 1.63E-04 9.78E-05 1.56E-04 2.49E-04 1.5

!MTM DDG2A EDG 2A unavailable due to maintenance 69913 94L.6 72 1.38E-02 1.03E-02 1.35E-02 L.78E-02 L.32 ITTM-DDG2A EDG 2A unavailable due to testing 59913 L2.5 26 1.90E-04 1.15E-04 L.83E-04 2.89E-04 1.58

!MTM-DDG28 EDG 28 unavailable due to maintenance 70282 697.9 55 L.O2E-O2 7.51E-03 1.00E-02 1.33E-02 1.33 ITTM DDG2B EDG 28 unavailable due to testing 70282 7.9 26 1.20E-04 7.29E-05 1.15E-04 1.82E-04 1.58

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SUMMARY

Variable Hame Description Total Hourc Unavallable 95th %

hL EI

!MTM-RTBA Reactor trip breaker A train unavailable due to maintenance 55140 13 7

2.45E-O4 8.67E-05 2.LLE-O4 5.18E-04 2.44 ITTM RTBA Reactor trip breaker train A unavailable due to testing 66140 69.7 32 1.10E-03 7.O9E-O4 1.07E-03 1.62E-03 1.51

!MTM-RTBB Reactor trip breaker B train unavailable due to maintenance 55119 10.4 7

L.97E-O4 5.97E-05 L.70E-04 4.L6E-O4 2.44

!TTM-RTBB Reactor trip breaker train B unavailable due to testing 66119 76.6 35 1.21E-03 7.92E-04 1.17E-03 L.74E-03 L.48

!MTM-SSPA Solid state protection system train A unavailable due to maintenance 67327 38 9

6.70E-O4 2.73E-04 5.96E-04 1.31E-03 2.L9 ITTM SSPA Solid state protection system train A unavailable due to testing 67327 93.9 33 1.45E-03 9.43E-04 L.42E-O3 2.L3E-03 L.5

!MTM SSPB Solid state protection system train B unavailable due to maintenance 67327 33.4 8

6.03E-04 2.30E-04 5.29E-04 L.22E-03 2,3 ITTM SSPB Solid state protection system train B unavailable due to testing 67327 97 35 1.50E-03 9.85E-04 1.46E-03 2.L7E-03 L.48

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SUMMARY

Variable Hame Description Total Hou,lE.'

Total Events Itiledian gsth'o/0 EF IMTM ACAA ACA compressor A unavailable due to maintenance 58111 L78.6 L7 2.87E-O3 1.53E-03 2.70E-O3 4.77E-O3 L.76 IMTM ACAB ACA compressor B unavailable due to maintenance 68111 3L2.2 2L 4.93E-03 2.82E-03 4.59E-03 7.83E-03 L.67

!TTM-ACA ACA compressor unavailable due to testing 58111 0

0 IMTM CARA Containment air return fan A unavailable due to maintenance 58400 195.1 34 2.98E-03 1.94E-03 2.89E-03 4.32E-03 L.49 ITTM-CARA Containment air return fan A unavailable due to testing 58400 10 2

3.55E-04 3.52E-05 1.89E-04 1.14E-03 5.7

!MTM-CARB Containment air return fan B unavailable due to maintenance 58400 151.8 35 2.32E-O3 1.52E-03 2.25E-03 3.34E-03 1.48 ITTM-CARB Containment air return fan B unavailable due to testing 58400 7

3 L.79E-O4 3.09E-05 L.2LE-O4 5.02E-04 4.03 ITTM CAC PCA (A, B, or C) unavailable due to testing 22L6L5 0

0 MTM CAC PCA compressor (A, B, or C) unavailable due to maintenance 22r6Ls 9025.4 92 4.L4E-02 3.2rE-O2 4.09E-02 5.22E-O2 L.27

!MTM-CAD PCA compressor D unavailable due to maintenance 73872 3523.5 47 4.93E-02 3.43E-O2 4.82E-O2 6.77E-02 L.4L ITTM CAD PCA compressor D unavailable due to testing 73872 0

0

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 120

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SUMMARY

Variable Name Description Total Hourc Unavailable Total Events 5th %

llilEdian 95rh %

EF.

IMTM PMO Standby MFW pump unavailable due to maintenance 676s9 847.5 19 1.36E-02 7.52E-O3 L.29E-O2 2.20E-O2 L.7L ITTM-PMO Standby MFW pump unavailable due to testing 67659 0

0

!MTM-PRV Steam generator PORVS or atmospheric dump valve unavailable due to maintenance 270577 69.8 5

3.35E-04 L.O7E-O4 2.81E-04 7.43E-04 2.63 ITTM-PRV Steam generator PORVS or atmospheric dump valve unavailable due to testing 270577 0

0

!xPoRv332 PORV block valve 332-8 closed 657L2.6 7762.5 LOZ 1.20E-01 9.43E-02 1.19E-01, 1.49E-01 L.25

!xPoRV333 PORV block valve 333-8 closed 657L2.6 2503.1 101 3.87E-O2 3.04E-02 3.83E-02 4.83E-02 L.26

!XPORVBOTH Both PORV block valves 332?8 and 333-8 closed 657t2.6 29.L 6

5.75E-04 1.84E-04 4.82E-O4 1.28E-03 2.63

!TTM-TRP Pzr PT Unavailable 65685 59 15 1.00E-03 5.07E-04 9.37E-O4 L.74E-03 1.85 Reference 38, Tables 6.2-1, -2, -3, 6.4-1, and 6.5-1

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SUMMARY

mea Descriptioh CAS Compressor train unavailable due to test &

maintenance, average across 4 trains 4.54E-02 3.34E-02 36%

CSS Pump train unavailable due to test &

maintenance, average across 2 trains 9.10E-03 7.42E-03 23%

AFW Pump train unavailable due to test &

maintenance, average across 3 trains 7.19E-03 5.95E-03 ZLo/o RHR Pump train unavailable due to test &

maintenance, average across 2 trains 5.39E-03 5.33E-03 L%

CCP train unavailable due to test & maintenance, averaoe across 2 trains 4.LlE-03 4.07E-03 L%

Sl Pump train unavailable due to test &

maintenance, average across 2 trains 3.99E-03 3.95E-03 Lo/o DG unavailable due to test & maintenance, averaqe across 4 DGs L,2TE-02 L.25E-O2

-3%

ACAS Compressor train unavailable due to test &

maintenance, average across 2 trains 3.90E-03 4.30E-03

-9%

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 122

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SUMMARY

Table 34 -- Gommon Cause Groups and MGL Variables EEil*L

,nl Acrobatffiunent

Reference:

CAFTA R1 Model

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page:123

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SUMMARY

Table 35 -- Comparison of MGL Variables TYPE CODE DESCRIPTION CAFTA Rl CAFTA RO Percent Change MEAN MEAN

  1. MOCFC RHR3G GAMMA-CCG=3-RHR MOTOR OPERATED VALVE FAILS TO CLOSE 1.00E-12 1.00E-10 99000A
  1. CKCFO SI 48 BETA-CCG=4-SI CHECK VALVE FAILS TO OPEN 3.30E-02 1.07E-01 224%
  1. CKRFO ERCSB BETA-CCG=8-GENERIC-ERCW CHECK VALVE FAILS TO OPEN 3.98E-02 1.18E-01 L960,A
  1. DGGFR EP 4G GAMMA-CCG=4-EP DIESEL GENERATOR FAILS TO RUN 2.L3E-01 6,31E-01 L95OA
  1. CKCFO RHR4B BETA-CCG=4-RHR CHECK VALVE FAILS TO OPEN 3.03E-02 8.80E-02 LgOOA
  1. DGGFD EP 48 BETA-CCG=4-EP DIESEL GENERATOR FAILS START 2.OLE-Oa 5.2LE-A2 L59OA
  1. POEFR ERC4B BETA-CCG=4-GENERIC-ERCW PUMP FAILS TO RUN 2.3LE-O2 5.95E-02 L580,/6
  1. PCOFR CCS4B BETA-CCG=4-GENERIC-COMPONENT COOUNG PUMP FAILS TO RUN 2.3LE-02 5.95E-Oz LsB%
  1. PCWFR LCV4B BETA-CCG=4-GENERIC CONDENSER COOLING WATER PUMP FAILS DURING OPERATION 2.3LE-O2 5.95E-02 158o/o
  1. CKRFC ERCSB BETA-CCG=8-ERCW CHECK VALVE FAlLS TO CLOSE 5.50E-02 1.68E-01 L55OA
  1. DGGFR EP 48 BETA-CCG=4-EP DIESEL GENERATOR FAILS TO RUN 2.86E-O2 7.L9E-02 L5L%
  1. FNSFD EP 48 BETA-CCG=4-GENERIC-EP FAN FAILS ON DEMAND 4.62E-02 1.15E-01 L49OA
  1. POEFD ERC4B BETA-CCG=4-GENERIC-ERCW PUMP FAILS ON DEMAND 4.62E-02 1.15E-01 L49%
  1. PCOFD-CCS4B BETA-CCG=4-GENERIC-COMPONENT COOLING PUMP FAILS ON DEMAND 4.62E-02 1.15E-01 r49%
  1. PSFFI EP 49 BETA-CCG=4-EP FUEL OIL TRANSFER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 4.62E-O2 1.15E-01 L49OA
  1. cKcFo_ccs4B BETA-CCG=4-GENERIC-CCS CHECK VALVE FAILS TO OPEN 4.62E-O2 1.15E-01 L49%
  1. CKCFO RCP4B BETA-CCG=4-GENERIC-RCP CHECK VALVE FAILS TO OPEN 4.62E-O2 1.15E-01 L49%
  1. cKcFo cvc4B BETA-CCG=4-GENERIC-CVCS CHECK VALVE FAILS TO OPEN 4.62E-O2 1.15E-01 L49%
  1. CKCFO MF 48 BETA-CCG=4-GENERIC-MF CHECK VALVE FAILS TO OPEN 4.62E-O2 1.15E-01 L49OA
  1. CKCFO MSS4B BETA-CCG=4-GENERIC MSS CHECK VALVE FAlLS TO OPEN 4.62E-O2 1.15E-01 L49o/6
  1. CKRFO ERC4B BETA-CCG=4-GENERIC-ERCW CHECK VALVE FAILS TO OPEN 4.62E-O2 1.1,5E-01 L49%
  1. AOCFC MSS4B BETA-CCG=4-GENERIC-MSS AIR OPERATED VALVE FAILS TO CLOSE 4.62E-O2 1.15E-01 L49%
  1. CKCFO AFW4B BETA-CCG=4-AFW CHECK VALVE FAILS TO OPEN 1.32E-01 3.21E-01 L430fr

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 124

Subject:

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SUMMARY

TYPE CODE DESCRIPTION CAFTA Rl CAFTA RO F*rcent Change MEAN MEAN

  1. CKRFC ERC4B BETA-CCG=4-ERCW CHECK VALVE FAILS TO CLOSE 6.2LE-O2 1.49E-01 L4oo,rt
  1. HXCPL CCS3B BETA-CCG=3-GENERIC-CCS HEAT EXCHANGER LOSS OF COOLING OR PLUGGING 2.46E-O2 5.63E-02 L29%
  1. RTBFO RPS4B BETA-CCG=4-RTB FAILS TO OPEN 1.10E-01 2.44E-0L L22%
  1. SRVFO POR3B BETA-CCG=3-GENERIC-PORV SRV FAILS TO OPEN ON DEMAND 4.92E-O2 1.09E-01 L22o/o
  1. STRPL ERC4B BETA-CCG=4-ERCW STRAI N ER P LUGG ED 1.95E-01 3.95E-01 1030,/6
  1. STRPL RCW4B BETA-CCG=4-RCW STRAI N ER PLUGG ED 1.95E-01 3.95E-01 LO3OA
  1. MOCFC RHR2B BETA-CCG=2-RHR MOTOR OPERATED VALVE FAILS TO CLOSE 3.78E-03 7.53E-03 990,4
  1. MOCFC CVC2B BETA-CCG=2-CVC MOTOR OPERATED VALVE FAILS TO CLOSE 3.78E-03 7.53E-03 99%
  1. PMAFR AFWzB BETA-CCG=2-AFW MOTOR DRIVEN PUMP FAILS DURING OPERATION 7.29E-03 L.45E-O2 99%
  1. CKCFC RHR2B BETA-CCG=2-RHR CHECK VALVE FAILS TO CLOSE 1.20E-02 2.37E-02 98o/o
  1. PSSFR SI 28 BETA-CCG=2-SI PUMP FAILS DURING OPERATION (AFTER FIRST HOUR) 1.40E-02 2.76E-02 97Yo
  1. PCCFR CVC2B BETA-CCG=2-CVCS MOTOR DRIVEN PUMP FAILS TO RUN L.40E-O2 2.76E-02 97%
  1. MOCFO PORzB BETA-CCG=2-POR MOTOR OPERATED VALVE FAILS TO OPEN r.67E-Oa 3.29E-02 97ot6
  1. MOCFO AFW2B BETA-CCG=2-AFW MOTOR OPERATED VALVE FAILS TO OPEN L.52E-02 2.99E-A2 970/6
  1. MOCFO RHR2B BETA-CCG=2-RHR MOTOR OPERATED VALVE FAILS TO OPEN 2.LOE-02 4.LLE-42 96o,ft
  1. MOCFO CVC2B BETA-CCG=2-CVC MOTOR OPERATED VALVE FAILS TO OPEN 2.LOE-Oa 4,LLE-OZ 96%
  1. PCOFR CCS2B BETA-CCG=2-GENERIC-COMPONENT COOLING PUMP FAILS TO RUN 2.52E-02 4.92E-02 95%
  1. FANFR RCPzB BETA-CCG=2-GENERIC-RCP FAN FAILS DURING OPERATION 2.52E-O2 4.92E-02 950,/6
  1. CMPSR PCA2B BETA-CCG=2-GENERIC-PCA COM PRESSOR FAILS TO RUN 2.52E-O2 4.92E-02 9s%
  1. PAOFR MF 28 BETA-CCG=2-MFW AUXILIARY OIL PUMP FAILS TO RUN 2.52E-O2 4.92E-02 95o,4
  1. PCVFR LCVzB BETA-CCG=2-GENERIC CONDENSATE VACUUM PUMP FAILS TO RUN 2.52E-02 4.92E-02 9so,rt
  1. PDBFR AFW2B BETA-CCG=2-GENERIC-DEMIN ERALIZED WATER BOOSTER PU MP FAILS TO RUN 2.52E-O2 4.92E-02 g50A
  1. POTFR RCP2B BETA-CCG=2-GENERIC-THERMAL BARRIER BOOSTER PUMP FAlLS TO RUN 2.52E-02 4.92E-02 9s%
  1. FANFR CNT2B BETA-CCG=2-GENERIC-CNT FAN FAILS DURING OPERATION 2.52E-O2 4.92E-O2 95%
  1. FANFR CSS2B BETA-CCG=2-GENERIC-CSS FAN FAILS DURING OPERATION 2.52E-O2 4.92E-O2 95%
  1. FNSFR CSS2B BETA-CCG=2-GENERIC-CSS FAN FAILS DURING OPERATION 2.52E-O2 4.92E-02 9s%

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 125

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

TYPE CODE DESCRIPTION CAFTA R1 CAFTA RO MEAN MEAN

  1. FNSFR CVC2B BETA-CCG=2-GENERIC-CVCS FAN FAILS DURING OPERATION 2.52E-02 4.92E-02 95o/o
  1. FNSFR RHR2B BETA-CCG=2-GENERIC-RHR FAN FAILS DURING OPERATION 2.52E-O2 4.92E-42 g50A
  1. FNSFR-SI-2B BETA-CCG=2-GENERIC-SI FAN FAILS DURING OPERATION 2.52E-02 4.92E-02 95o,4
  1. PCTFR AFW2B BETA-CCG=2-GENERIC CONDENSATE TRANSFER PUMP FAILS TO RUN 2.52E-02 4.92E-02 95o,4
  1. PIWFR MF 28 BETA-CCG=2-GENERIC-MF SEAL WATER INJECTION PUMP FAILS TO RUN 2.52E-O2 4.92E-02 95o,A
  1. HXRPL RHR2B BETA-CCG=2-GENERIC-RHR HEAT EXCHANGER LOSS OF COOLING OR PLUGGING 2.52E-02 4.92E-02 9s%
  1. PSSFI SI 28 BETA-CCG=2-SI PUMP FAILS DURING OPERATION (FIRST HOUR) 3.49E-O2 6.74E-O2 93%
  1. PCCFD CVC2B BETA-CCG=2-CVCS MOTOR DRIVEN PUMP FAl6 TO START 3.49E-02 6.74E-O2 93%
  1. AOCFO AFW2B BETA-CCG=2-AFW AIR OPERATED VALVES FAIL TO OPEN 3.65E-02 7.O6E-02 93o/o
  1. PSRFI RHR2B BETA-CCG=2-RHR PUMP FAILS ON DEMAND 3.91E-02 7.53E-02 930,4
  1. cKcFo css2B BETA-CCG=2-CSS CHECK VALVE FAILS TO OPEN 4.t3E-O2 7.93E-O2 92%
  1. CKCFO RHR2B BETA-CCG=2-RHR CHECK VALVE FAILS TO OPEN 4.13E-02 7.93E-02 920/6
  1. CBKFC EP 28 BETA-CCG=2-EP BREAKER FAILS TO CLOSE 4.L3E-02 7.93E-02 92%
  1. PCSFI CSS2B BETA-CCG=2-CSS PUMP FAlLS ON DEMAND 4.65E-02 8.89E-02 9LOA
  1. MOCFO CSS2B BETA-CCG=2-CSS MOTOR OPERATED VALVE FAILS TO OPEN 4.92E-O2 9.38E-02 9L%
  1. FANFD RCP2B BETA-CCG=2-GENERIC-RCP FAN FAILS ON DEMAND 5.04E-02 9.60E-02 90%
  1. PCOFD CCS2B BETA-CCG=2-GENERIC-COMPONENT COOLING PUMP FAILS ON DEMAND 5.04E-02 9.60E-02 90o,A
  1. MOCFC CNT2B BETA-CCG=2-GENERIC-CNT MOTOR OPERATED VALVE FAILS TO CLOSE 5.04E-02 9.50E-02 gAoft
  1. MOCFC SGl2B BETA-CCG=2-SGIV MOTOR OPERATED VALVE FAILS TO CLOSE 5.04E-02 9.50E-02 90%
  1. MOCFO MF 28 BETA-CCG=2-MF MOTOR OPERATED VALVE FAILS TO OPEN 5.04E-02 9.60E-02 90%
  1. MORFO CSS2B BETA-CCG=2-CSS MOTOR OPERATED VALVE FAILS TO OPEN 5.04E-02 9.60E-02 90%
  1. PCBFR MF 28 BETA-CCG=2-GENERIC-CONDENSATE BOOSTER PUMP FAILS TO RUN 5.04E-02 9.60E-02 90%
  1. CMPSD PCA2B BETA-CCG=2-GENERIC-PCA COMPRESSOR FAILS ON DEMAND 5.04E-02 9.60E-02 900,4
  1. PAOFD MF 28 BETA-CCG=2-MFW AUXILIARY OIL PUMP FAILS ON DEMAND 5.04E-02 9.50E-02 90%
  1. PCBFD MF 29 BETA-CCG=2-GENERIC-CONDENSATE BOOSTER PUMP FAILS ON DEMAND 5.04E-02 9.50E-02 90ot6

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:126

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

TYPE CODE DESCRIPTION CAFTA Rl CAFTA RO Percent Change MEAN MEAN

  1. PCTFD AFW2B BETA-CCG=2-GENERIC CONDENSATE TRANSFER PUMP FAILS ON DEMAND 5.04E-02 9.60E-02 90o,A
  1. PDBFD AFW2B BETA-CCG=2-GENERIC DEMINERALIZED WATER BOOSTER PUMP FAILS ON DEMAND 5.04E-02 9.50E-02 900,4
  1. PIWFD MF 2B BETA-CCG=2-GENERIC-MF SEAL WATER INJECTION PUMP FAILS ON DEMAND 5.04E-02 9.60E-02 90%
  1. POTFD RCP2B BETA-CCG=2-GENERIC-THERMAL BARRIER BOOSTER PUMP FAILS ON DEMAND 5.04E-02 9.60E-02 900,4
  1. RELFD-POR2B BETA-CCG=2-GENER C-PORV & SV RELAY FAILS ON DEMAND 5.04E-02 9.50E-02 90o,A
  1. RELFD RHR2B BETA-CCG=2-GENER C-RHR RELAY FAILS ON DEMAND 5.04E-02 9.60E-02 900,/6
  1. SOVFO PCA2B BETA-CCG=Z-GENER C-PCA SOV FAILS TO OPEN ON DEMAND 5.04E-02 9.60E-02 90%
  1. AOCFO POR2B BETA-CCG=Z-GENER C-PORV AlR OPERATED VALVE FAILS TO OPEN 5.04E-02 9.60E-02 goort
  1. CKCFO RCP2B BETA-CCG=2-GENER C-RCP CHECK VALVE FAILS TO OPEN 5.04E-02 9.60E-02 90o,A
  1. cKcFo ccs2B BETA-CCG=Z-GENER C-CCS CHECK VALVE FAILS TO OPEN 5.04E-02 9.50E-02 90%
  1. CKCFO MF 28 BETA-CCG=2-GENER C-MF CHECK VALVE FAILS TO OPEN 5.04E-02 9.50E-02 90%
  1. CKCFO POR2B BETA-CCG=2-GENER C-PORV & SV CHECK VALVE FAILS TO OPEN 5.04E-02 9.60E-02 90ot6
  1. CKRFO CCS2B BETA-CCG=2-GENER C-CCS CHECK VALVE FAILS TO OPEN 5.04E-02 9.50E-02 90%
  1. FNSFD CSS2B BETA-CCG=2-GENER C-CSS FAN FAILS ON DEMAND 5.04E-02 9.50E-02 goofr
  1. FNSFD CVCzB BETA-CCG=2-GENER C.CVCS FAN FAILS ON DEMAND 5.04E-02 9.50E-02 90o,ft
  1. FNSFD RHR2B BETA-CCG=2-GENER C.RHR FAN FAILS ON DEMAND 5.04E-02 9.60E-02 90%
  1. FNSFD SI 28 BETA-CCG=2-GENER C-SI FAN FAILS ON DEMAND 5.04E-02 9.60E-02 900,4
  1. FANFD CNT2B BETA-CCG=2-GENER C-CNT FAN FAILS ON DEMAND 5.04E-02 9.50E-02 90%
  1. FANFD CSS2B BETA-CCG=2-GENER C.CSS FAN FAILS ON DEMAND 5.04E-02 9.50E-02 90%
  1. PSRFR RHR2B BETA-CCG=2-RHR PUMP FAILS DURING OPERATION 5.79E-02 1.09E-01 880,4
  1. cKcFo cvczB BETA-CCG=2-CVC CHECK VALVE FAILS TO OPEN 6.38E-02 1.20E-01 88%
  1. CKCFO SI 28 BETA-CCG=2-SI CHECK VALVE FAILS TO OPEN 5.38E-02 1.20E-01 880,/6
  1. PMAFD AFW2B BETA-CCG=2-AFW MOTOR DRIVEN PUMP FAILS ON DEMAND 6.55E-02 L.23E-01 88o/o
  1. CKCFO AFW2B BETA-CCG=2-AFW CHECK VALVE FAILS TO OPEN 1.64E-01 2.82E-01 720A
  1. MOCFC cs528 BETA-CCG=2-CSS MOTOR OPERATED VALVE FAIIS TO CLOSE 1.57E-01 2.85E-01 7Lo/o

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 127

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

TYPE CODE DESCR!PTlOfrl CAFTA Rl CAFTA RO Percent Change MEAN MEAN

  1. CKRFC ERCSG GAMMA-CCG=8-ERCW CHECK VALVE FAILS TO CLOSE 4.52E-01 5.17E-01 37Yo
  1. STRPL RCW4G GAM MA-CCG=4-RCW STRAI N ER PLUGGED 4.44E-OI 5.85E-01 32o,4
  1. STRPL ERC4G GAM MA-CCG=4-ERCW STRAI N ER PLUGGED 4.44E-OL 5.86E-01 32%
  1. CBKFO EP 4G GAMMA-CCG=4-EP BREAKER FAILS TO OPEN 3.56E-01 4.73E-01 290/6
  1. CBKFO EP 4D DELTA-CCG=4-EP BREAKER FAILS TO OPEN 1.12E-01 L.44E-OL 29%
  1. AOCFO AFW4G GAMMA-CCG=4-AFW AIR OPERATED VALVES FAIL TO OPEN 4.11E-01 5.28E-01 28%
  1. CMPSD PCA3G GAMMA-CCG=3-GEN ERIC-PCA COMPRESSOR FAILSON DEMAN D 3.65E-01 4.54E-01 27o/o
  1. CMPSR PCA3G GAMMA-CCG=3-GENERIC-PCA COMPRESSOR FAILS TO RUN 3.66E-01 4.64E-0L 27ot6
  1. CBKFC EP 4G GAMMA-CCG=4-EP BREAKER FAILS TO CLOSE 4.7aE-OL 5.98E-01 27o/o
  1. AOCFO AFW4D DELTA-CCG=4-AFW AIR OPERATED VALVES FAIL TO OPEN 1.94E-01 2,43E-01 2s%
  1. FNSFD EP 4G GAMMA-CCG=4-GENERIC-EP FAN FAILS ON DEMAND 5.O2E-01 6.28E-01 25o,A
  1. POEFR ERC4G GAMMA-CCG=4-GENERIC-ERCW PUMP FAILS TO RUN 5.02E-01 5.28E-01 25%
  1. PCOFR CCS4G GAMMA-CCG=4-GENERIC-COMPONENT COOLING PUMP FAILS TO RUN 5.02E-01 5.28E-01 25%
  1. POEFD ERC4G GAMMA-CCG=4-GENERIC-ERCW PUMP FAILS ON DEMAND 5.02E-01 6.28E-01 250,4
  1. PCOFD CCS4G GAMMA-CCG=4-GENERIC-COMPONENT COOLING PUM P FAILS ON DEMAND 5.02E-01 6.28E-01 25o,fi
  1. AOCFC MSS4G GAMMA-CCG=4-GENERIC-MSS AIR OPERATED VALVE FAILS TO CLOSE 5.02E-01 6.28E-01 25%
  1. cKcFo_cvc4G GAMMA-CCG=4-GENERIC-CVCS CHECK VALVE FAILS TO OPEN 5.02E-01 6.28E-01 2s%
  1. CKCFO MF 4G GAMMA-CCG=4-GENERIC-MF CHECK VALVE FAILS TO OPEN 5.02E-01 6.28E-01 25o/o
  1. CKCFO MSS4G GAMMA-CCG=4-GENERIC MSS CHECK VALVE FAILS TO OPEN 5.02E-01 6.28E-01 25o,ft
  1. cKcFo ccs4c GAMMA-CCG=4-GENERIC-CCS CHECK VALVE FAILS TO OPEN 5.02E-01 6.28E-01 250,4
  1. CKCFO-RCP4G GAMMA-CCG=4-GENERIC-RCP CHECK VALVE FAIIS TO OPEN 5.02E-01 6.28E-01 2s%
  1. PCWFR LCV4G GAMMA-CCG=4-GENERIC CONDENSER COOLING WATER PUMP FAILS DURING OPERATION 5.02E-01 6.28E-01 250/6
  1. PSFFI EP 4G GAMMA-CCG=4-EP FUEL OIL TRANSFER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 5.02E-01 6.28E-01 25o,fr
  1. CKRFC ERC4G GAMMA-CCG=4-ERCW CHECK VALVE FAILS TO CLOSE 4.93E-01 6.16E-01 25ot6
  1. DGGFD EP 4D DELTA-CCG=4-EP DIESEL GENERATOR FAILS START 2.76E-OL 3.37E-01 22%
  1. DGGFD EP 4G GAMMA-CCG=4-EP DIESEL GENERATOR FAILS START 5.37E-01 6.55E-01 2204

Calculation No. M DN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 128

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

TYPE CODE DESCRIPTION CAFTA R1 CAFTA RO Percent Change MEAN MEAN

  1. CKRFO ERCSG GAMMA-CCG=8-GENERIC-ERCW CHECK VALVE FAILS TO OPEN 5.35E-0L 7.75E-01 22o/o
  1. CKRFC ERC4D DELTA-CCG=4-ERCW CHECK VALVE FAILS TO CLOSE 3.02E-01 3.55E-01 2Lot6
  1. DGGFR EP 4D DELTA-CCG=4-EP DIESEL GENERATOR FAILS TO RUN 2.64E-OL 3.18E-01 200,/6
  1. CKCFO AFW4G GAMMA-CCG=4-AFW CHECK VALVE FAILS TO OPEN 6.36E-01 7.66E-01 20o,fr
  1. CBKFC EP 4D DELTA-CCG=4-EP BREAKER FAILS TO CLOSE 3.24E-OL 3.89E-01 20o,A
  1. POEFD ERC4D DELTA-CCG=4-GENERIC-ERCW PUMP FAILS ON DEMAND 3.45E-01 4.L3E-01 20%
  1. PCOFD CCS4D DELTA-CCG=4-GENERIC-COMPONENT COOLING PUMP FAILS ON DEMAND 3.45E-01 4.L3E-01 20o,A
  1. FNSFD EP 4D DELTA-CCG=4-GENERIC-EP FAN FAIIS ON DEMAND 3.45E-01 4.L3E-01 20%
  1. PSFFI EP 4D DELTA-CCG=4-EP FUEL OIL TRANSFER PUMP FAILS TO START OR DURING FIRST HOUR OF OPERATION 3.45E-01 4.L3E-01 200,/6
  1. RELFD POR4D DELTA-CCG=4-GENERIC-PORV & SV RELAY FAILS ON DEMAND 3.45E-01 4.L3E-01 20%
  1. POEFR ERC4D DELTA-CCG=4-GENERIC-ERCW PUMP FAlLS TO RUN 3.45E-01 4.L3E-01 20o,ft
  1. AOCFO MF 4D DELTA-CCG=4-GENERIC-MF AIR OPERATED VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 20o,A
  1. PCOFR CCS4D DELTA-CCG=4-GENERIC-COMPONENT COOLING PUMP FAILS TO RUN 3.45E-01 4.L3E-01 20ot6
  1. AOCFC MSS4D DELTA-CCG=4-GENERIC-MSS AIR OPERATED VALVE FAILS TO CLOSE 3.45E-01 4.t3E-01 20o,A
  1. cKcFo ccs4D DELTA-CCG=4-GENERIC-CCS CHECK VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 20%
  1. CKCFO RCP4D DELTA-CCG=4-GENERIC-RCP CHECK VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 20o,ft
  1. cKcFo cvc4D DELTA-CCG=4-GENERIC-CVCS CHECK VALVE FAILS TO OPEN 3.45E-01 4.13E-01 20o/o
  1. CKCFO MF 4D DELTA-CCG=4-GENERIC-MF CHECK VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 20%
  1. cKcFo Mss4D DELTA-CCG=4-GENERIC MSS CHECK VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 200,4
  1. CKRFO ERC4D DELTA-CCG=4-GENERIC-ERCW CHECK VALVE FAILS TO OPEN 3.45E-01 4.L3E-01 20%
  1. CKCFO RHR4D DELTA-CCG=4-RHR CHECK VALVE FAILS TO OPEN 3.54E-01 4.22E-OL L9%
  1. CKRFC ERCSD DELTA-CCG=8-ERCW CHECK VALVE FAILS TO CLOSE 6.00E-01 6.94E-01 16%
  1. CKRFO ERCSD DELTA-CCG=8-GENERIC-ERCW CHECK VALVE FAILS TO OPEN 6.05E-01 5.99E-01 16%
  1. CKCFO SI 4D DELTA-CCG=4-SI CHECK VALVE FAILS TO OPEN 5.00E-01 5.71E-01 L4%
  1. STRPL ERC4D DELTA.CCG=4-ERCW STRAI N ER PLUGGED 5.70E-01 6.38E-01 I20fr
  1. STRPL RCW4D DELTA-CCG=4-RCW STRAI N ER PLUGG ED 5.70E-01, 5.38E-01 L20fr
  1. CKCFO RHR4G GAMMA-CCG=4-RHR CHECK VALVE FAILS TO OPEN 8.00E-01 8.70E-01 9o,A

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:129

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

TYPE CODE DESCRIPTION CAFTA R1 CAFTA RO Percent

'Change MEAN MEAN

  1. CKCFO AFW4D DELTA-CCG=4-AFW CHECK VALVE FAILS TO OPEN 7.49E-OL 7.98E-01 7ofi
  1. CKCFO SI 4G GAMMA-CCG=4-SI CHECK VALVE FAILS TO OPEN 9.99E-01 9.99E-01 ooA
  1. RTBFO RPS2B BETA-CCG=2-RPS REACTOR TRIP BREAKER FAIL TO OPEN 4.30E-02 4.30E-02 o%
  1. UVDCF ESF2B BETA-CCG=2-ESFAS UNDERVOLTAGE DRIVER CARD FAILS 2.90E-02 2.90E-O2 o%
  1. UVDCF RPS2B BETA-CCG=2-RPS UNDERVOLTAGE DRIVER CARD FAILS 2.90E-O2 2.90E-O2 o%
  1. UNLCF ESF2B BETA-CCG=2-ESFAS UNIVERSAL LOGIC CARD FAILS 4.40E-O2 4.40E-02 o%
  1. UNLCF RPS2B BETA-CCG=2-RPS UNIVERSAL LOGIC CARD FAILS 4.40E-02 4.40E-O2 o%

References:

CAFTA R1 Model, CAFTA R0 Model

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 130

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 36 - Summary of Pre-lnitiatorActions and Probabilities Event ID Basic Event Description Pcog P"t" Total HEP Error Factor WHEAFW Turbine Driven AFW Isolation Test Error N/A 6.0e-05 6.0e-05 10 WHEBLK lce Condenser Lower lnlet Doors Blocked Closed N/A 2.10E-04 2.10E-04 10 WHECLM Galibration Test Error Alignment for AFW Suction Header Pressure Switches N/A 1.70E-02 1.70E-02 5

WHECSA RWST Purification Flow lnterference - (Containment Spray Diversion Path)

N/A 1.00E-03 1.00E-03 5

WHEEMC 1 Miscalibration of RWST level-Channe! 1 N/A 2.90E-03 2.90E-03 5

WHEEMC 2 Miscalibration of RWST Ievel-Ghannel 2 N/A 2.90E-03 2.90E-03 5

WHEEMC-3 Miscalibration of RWST Ievel-Channel 3 N/A 2.90E-03 2.90E-03 5

WHEEMC-4 Miscalibration of RWST level-Ghanne! 4 N/A 2.90E-03 2.90E-03 5

WHE!SH lsolation of Containment Spray Header N/A 4.3e-04 4.3e-05 10 WHEMDA 1 Motor Driven AFW Pump Train A Isolation Test Error N/A 1.2e-04 1.2e-04 10 WHEMDA-2 Motor Driven AFW Pump Train B Isolation Test Error N/A 1.2e-04 1.2e-04 10 WHEPOR Calibration Error in PORV relief setpoint N/A 1.70E-03 8.60E-04 10 WHESDB-1 6.9kV Shutdown Board 1-A Automatic Features Disabled N/A 3.3e-03 2.0e-06 10 WHESDB-2 6.9kV Shutdown Board 1-B Automatic Features Disabled N/A 3.3e-03 2.0e-06 10 WHESDB-3 6.9kV Shutdown Board 1-A Automatic Features Disabled N/A 3.3e-03 2.0e-06 10 WHESDB 4 6.9kV Shutdown Board 1-B Automatic Features Disabled N/A 3.3e-03 2.0e-06 10 WHESGS Miscalibration of Steam Generator Safety Valves N/A 1.9e-02 1.4e-02 5

WHESUM Remove Drain Plugs from Refueling Canal After Refueling N/A 2.1e-06 3.5e-07 10 Reference 37, Table 10-1.

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 131

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 37 - Summary of Post-lnitiatorActlons and Probabilities Event ID Basic Event Description Pcog P"*"

Total HEP Error Factor AFWOPl Depressurize/cooldown to low pressure injection following MLOCA 1.20E-04 2.10E-02 2.10E-02 5

AFWOP2 Depressurize/cooldown to LPI following small break LOCA with failure of HPI 1.20E-04 2.40E-A2 2.40E-02 5

AFWOP3 Depressurize/cooldown to low pressure injection following small LOCA with failure of HP recirc 1.20E-04 1.10E-02 1.10E-A2 5

AFWOP5 Depressurize Steam generator during SGTR following isolation 1.20E-A4 5.20E-03 5.30E-03 5

DHAAC2 Isolate Spent Fuel Pool Cooling to minimize heat load on RH 3.00E-04 1.20E-02 1.20E-02 5

DHAAE2 Start ERCW pumps on LOSP for DG cooling 1.60E-02 2.60E-02 4.20E-02 5

DHAERCWS Operators fail to clear ERCW screens before plant trip 3.00E-04 3.50E-03 3.80E-03 5

HA61gOSDX3 WBN operator actions to align portable diesel generator to 6090V shutdown board 1.90E-03 3.40E-03 5.30E-03 5

HAAEl Start standby ERGW pump - running pump fails (nonl) 2.00E-04 2.90E-06 2.00E-04 10 HAAEIE Start standby ERCW pump - operating pump fails - Ironnal ops 1.00E-04 1.70E-03 1.80E-03 5

HAAFl Locally operate TD AFW valves to contro! flow on SBO 3.20E-04 2.10E-02 2.20E-02 5

HAAF2 Align ERCW supply to AFW pumps 7.50E-04 2.10E-03 2.90E-03 5

HAAF3 Align HPFP to provide makeup to the SGs 4.00E-04 2.60E-03 3.00E-03 5

HACAR Manually initiate containment air return fan system 2.30E-04 1.30E-03 1.50E-03 5

HACDl Perform cooldown with main feedwater, following AFW failure 1.00E-02 2.40E-02 3.40E-02 5

HACHl Transfer Containment Spray to Sump (RHR Swap Successful) 1.20E-04 1.10E-02 1.10E-02 5

HACH2 Transfer Containment Spray to Sump (RHR Swap Failed) 1.60E-03 3.30E-03 4.80E-03 5

HACIl Backup Gontainment Isolation, Given Loss of All AC Power 1.00E-04 7.00E-05 1.70E-04 10

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:132

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 37 - Surnmary of PosG,ln:itiatorActions and Probabilities Event ID Basic Event Description Pcos P"*"

Total HEP Error Factor HACSl Manually initiate containment spray 1.00E-03 1.40E-04 1.10E-03 5

HACV2 Manually start standby CCP, given running pump fails (plant trip, no SI) 1.00E-04 1.80E-03 1.90E-03 5

HAE82 lnitiate emergency boration during ATWS 1.10E-03 3.60E-02 3.70E-02 5

HAERCW1A Crosstie Opposite Unit & Train ERCW Headers (1B-B strainer plugged) 1.00E-04 9.80E-03 9.90E-03 5

HAERCW2 WBN operator actions to crosstie portable 5,000 GPM fire pump to ERCW header 4.70E-04 7.80E-A2 7.80E-02 5

HAERCW3 WBN operator actions to crosstie permanent 2,500 GPM fire pump to ERCW header (14d) 4.70E-04 4.90E-02 5.00E-02 5

HAFRl Restore AFW control following initiator and loss of air 9.50E-04 2.70E-03 3.70E-03 5

HAHHl Place Hydrogen igniters in seruice 1.00E-03 1.30E-03 2.30E-03 5

HAISl lsolate LOCA outside containment (!S LOCA) 2.00E-03 4.30E-02 4.40E-O2 5

HAL21 Operator uses S/G PORVs to control SG pressure (high RCS Pressure, Dry S/c) 1.10E-03 1.90E-03 3.00E-03 5

HAMUl Makeup to RWST lnventory Following a SGTR Event 6.50E-04 1.10E-03 1.70E-03 5

HAMU2 Makeup to RWST during IS LOGA 3.20E-03 1.70E-02 2.00E-02 5

HAMU2B Makeup to RWST using containment spray test recirc from sump during small LOCA 3.10E-03 1.90E-03 5.00E-03 5

HAMU3 Makeup to GST lnventory Following Reactor Trip with AFW 4.00E-04 5.20E-04 9.20E-04 10 HAOBl Establish RCS Bleed and Feed cooling 5.50E-04 1.60E-02 1.60E-02 5

HAO82 Establish RCS Bleed and Feed cooling given no CCPS running 5.50E-04 1.60E-02 1.60E-02 5

HAOFl Restore main feedwater, following AFW failure GT no Sl req'd 9.50E-04 5.20E-03 6.20E-03 5

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Table 37 - Summary of Post{nitlator Ac'tions and Probabilities Event lD Basic Event Description Pcog Po" Total HEP Error Factor HAOF2 Restore main feedwater, following AFW failure GT & Sl req'd 1.30E-03 1.30E-02 1.40E-02 5

HAOSl Align ECCS to protect core (ESFAS fails/large break) 1.20E-03 8.50E-04 2.00E-03 5

HAOS2 Start ECGS (ESFAS fails/small RCS or SG break) 2.50E-04 1.80E-04 4.30E-04 10 HAOS3 Start AFW (Reactor trip, no SI) 1.00E-04 8.80E-05 1.90E-04 10 HAOSBF Steam generator feed with manual level control fails 2.00E-01 1

HAPRl lsolate open PORV with block valve after SI 1.00E-04 4.40E-03 4.50E-03 5

HAPRZ Open pressurizer PORV to depressurize RGS and prevent TIGTR 3.00E-04 1.40E-04 4.40E-04 10 HARDl Establish shutdown cooling (RHR in service) following SGTR 2.20E-04 2.70E-03 2.90E-03 5

HARHl Transfer to hot leg recirculation - large LOCA 1.00E-04 2.80E-03 2.90E-03 5

HARLl Recover from auto swapover failure 1.00E-04 2.20E-03 2.30E-03 5

HARRl Align high pressure recirculation, given auto swapover works 1.20E-04 3.70E-03 3.80E-03 5

HARSl Start RHR spray (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> into evenUhigh cont pressure) 3.00E-04 6.70E-04 9.70E-04 10 HARTl Manually trip reactor, given SSPS fails 1.00E-03 4.30E-04 1.40E-03 5

HASBXT Operator actions to crosstie shutdown boards during unit blackout 1.00E-04 1.10E-02 1.10E-02 5

HASEl Stop RGPs on Phase B isolation (Non-LOCA lnitiator) 1.00E-02 1.70E-03 1.20E-02 5

HASE2 Trip RCPs on loss of Component Cooling Water 1.00E-04 1.70E-03 1.80E-03 5

HASLl lsolate ruptured steam generator 1.00E-04 1.10E-03 1.20E-03 5

HASL3 lsolate ruptured steam generator from TD AFW pump 3.00E-04 2.50E-04 5.50E-04 10 HASL4 lsolate steam generators during secondary (steamline) break 1.00E-02 6.30E-03 1.60E-02 5

HASLZ lsolate dry steam generator (Leve! 2 action) 3.00E-04 1.90E-03 2.20E-03 5

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Tabte 37 - Summary of Post-lnitiatorActions and Probabilities Event lD Basic Eyent Description Et eog P.*"

Total HEP Error Factor HASPl Locally operate TD AFW pump after battery depletion 3.00E-05 1.90E-02 1.90E-02 5

HCCSR2 Align and Initiate Alternate Cooling to the Charging Pump 1.00E-04 1.60E-02 1.60E-02 5

HCCSR3 Grosstie Opposite Unit & Train ERCW Headers (1A-A strainer failed) 1.00E-04 3.40E-03 3.50E-03 5

HGCSR4 Align & Initiate Alternate Cooling to 1A-A CCP, 1B-B failed 1.00E-04 6.50E-02 6.50E-02 5

HCRLl lnadvertently Reset SI Signal, Failure of Auto Sump Swapover 0.00E+OO 3.80E-03 3.80E-03 5

HDAR1 Align spare battery charger following failure of normal charger 1.00E-04 7.20E-05 1.70E-04 10 HTPRl Start TD AFW pump and control LCVs during LOSP (fails to start initially) 8.50E-04 8.30E-04 1.70E-03 5

OPCMPA Start air compressors A and B following LOSP 3.00E-04 8.70E-03 9.00E-03 5

RSIOP Operator Restarts Safety lnjection to restore RCS makeup 4.00E-04 2.90E-04 6.90E-04 10 SSIOP Terminate Safety lnjection to prevent PORV water challenge 4.00E-03 2.70E-03 6.70E-03 5

Reference 37, Ta ble 10-2

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Table 38 - Summary of Fl@fiii0.:Recovery Actions and Probabilities Event ID Basic Event Deecription Pcog P"*"

Total HEP Error Factor FLAB1 R lsolate ERCW pipe failure in Aux Building 2.50E-04 4.20E-02 4.20E-02 5

FLAB2R lsolate ESF room cooling due to large (severa! thousand gpm flood) ERCW pipe failure in Aux Building 1.00E-04 1.70E-03 1.80E-03 5

FLA82RS lsolate ESF room cooling due to large (1 to 2 thousand gpm flood) ERCW pipe failure in Aux Building 1.00E-04 1.20E-03 1.30E-03 5

FLAB3G lsolate a break in the CST discharge piping 1.00E-04 4.50E-02 4.50E-02 5

FLA84F lsolate break in HPFP line (supplied by RCW - HPFP diesel pump does not start) 1.00E-04 1.30E-01 1.30E-01 1

FLABTR lsolate RCW break in Aux Bldg 2.50E-04 3.80E-02 3.80E-02 5

FLABSR Isolate ERGW discharge line failure in Aux Building 1.80E-04 2.10E-01 2.10E-01 1

FLABSRS lsolate ERCW discharge line failure in Aux Building (small) 1.80E-04 6.70E-02 6.70E-02 5

FLAB9W Isolate break in RWST piping in Aux Building (large) 1.20E-04 2.80E-03 2.90E-03 5

FLTB1C lsolate CCW following major break in Turbine Building 1.00E-04 9.90E-03 1.00E-02 5

Reference 37, Table 10-3

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Table 39 -- Comparison of HEPs Event lD Basic Event Descriotion CAFTA RO GAFTA R1 FLAB1 R Isolate ERCW pipe failure in Aux Building 4.20E-02 4.20E-02 o%

HASEl Stop RCPs on Phase B isolation (Non-LOCA lnitiator) 1.20E-A2 1.20E-02 o%

FLAB3C lsolate a break in the CST discharge piping 4.50E-02 4.50E-02 a%

HARRl Align high pressure recirculation, given auto swapover works 3.80E-03 3.80E-03 o%

HAOBl Establish RCS Bleed and Feed cooling 1.60E-02 1.60E-02 o%

HAOFl Restore main feedwater, following AFW failure GT no Sl req'd 6.20E-03 6.20E-03 o%

HAO82 Establish RCS Bleed and Feed cooling given no CCPS runnins 1.60E-02 1.60E-02 Oot6 HAOF2 Restore main feedwater, following AFW failure GT & SI req'd 1.40E-02 1.40E-02 Oot6 HAAEIE Start standby ERGW pump - operating pump fails - honnal ops 1.80E-03 1.90E-03 o%

HAPRl Isolate open PORV with block valve after SI 4.50E-03 4.50E-03 00,/6 HACHl Transfer Containment Spray to Sump (RHR Swap Successful) 1.10E-02 1.10E-02 o%

HAOS3 Start AFW (Reactor trip, no SI) 1.90E-04 1.90E-04 006 HACH2 Transfer Containment Spray to Sump (RHR Swap Failed) 4.80E-03 4.80E-03 Oot6 HAE82 lnitiate emergency boration during ATWS 3.70E-02 3.70E-02 00/6 HARDl Establish shutdown cooling (RHR in service) followinq SGTR 2.90E-03 2.90E-03 00,6 WHECLM Galibration Test Error Alignment for AFW Suction Header Pressure Switches 1.70E-02 1.70E-02 Oo/o WHESUM Remove Drain Plugs from Refueling Canal After Refuelins 3.50E-07 3.50E-07 006 HAAFl Locally operate TD AFW valves to control flow on SBO 2.20E-02 2.20E-02 Oot6 HAMU2 Makeup to RWST during lS LOCA 2.00E-02 2.00E-02 o%

HAHHl Place Hydrogen igniters in service 2.30E-03 2.30E-03 o%

HASE2 Trip RGPs on loss of Component Gooling Water 1.80E-03 1.80E-03 o%

HAMUl Makeup to RWST lnventory Following a SGTR Event 1.70E-03 1.70E-03 00,6 HARTl Manually trip reactor, given SSPS fails 1.40E-03 1.40E-03 Oot6 HAOSl Align EGCS to protect core (ESFAS fails/larse break) 2.00E-03 2.00E-03 o%

WHEEMC Miscalibration of RWST leve!

WHEEMC 1 Miscalibration of RWST level-Channel 1 2.90E-03 2.90E-03 o%

WHEEMC 2 Miscalibration of RWST leve!-Channel 2 2.90E-03 2.90E-03 ooA WHEEMC 3 Miscalibration of RWST level-Ghannel 3 2.90E-03 2.90E-03 Oo/o

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Event lD Basic E*ent Description CAFTA RO WHEEMC-4 Miscalibration of RWST leve!-Channel 4 2.90E-03 2.90E-03 a%

HACIl Backup Gontainment Isolatior, Given Loss of All AC Power 1.70E-04 1.70E-04 o%

HASLl lsolate ruptured steam generator 1.20E-03 1.20E-03 o%

HAAEl Start standby ERGW pump - running pump fails (non-Sl) 2.00E-04 2.00E-04 Oot6 HARSl Start RHR spray (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> into evenUhigh cont pressure) 9.70E-04 9.70E-04 o%

FLAB2R Isolate ESF room cooling due to large (several thousand gpm flood) ERCW pipe failure in Aux Buildinq 1.80E-03 1.80E-03 o%

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Syptem System Operatlngl Standbv 1

Main Steam and Ancillary Steam Systems Operating Treated in baseline PRA as SLBOC Steam Line break outside containment will induce a reactor trio.

2t3 Main Feedwater and Condensate systems Operating Treated in baseline PRA as TLMFW Secondary line breaks outside containment will induce a reactor trip with loss of main feedwater.

3a Auxiliary Feedwater System Standby 395,000 Break in the Auxiliary Feedwater line will not induce an automatic reactor trip. LCO-3.7.6 allows for up to 7 days to restore CST level above 200,000 gal, provided that ERCW is available as a backup.

24 Raw Cooling Water System Operating lnfinite RCW flow rate is bounded by CCW flow rate for flood in Turbine Building.

Complete loss of RCW can induce turbine and reactor trip. lf stator outlet temperature reaches 90'C (194'F) for 45 seconds with unit load greater than 15o/o, the turbine will trip. lf the turbine trips above P-9 (50% power), the reactor will trip (see Reference 266, Section 2.3) 26 High Pressure Fire Protection System Standby pressurized lnfinite No reactor trip or emergency shutdown is expected following a loss of fire orotection svstem.

27 Condenser Circulating Water System Operating lnfinite lncludes piping and expansion joints (2 for water box)

Loss of Condenser Circulating Water System is expected to induce an initiatinq event.

29 Potable Water Distribution System Operating lnfinite Loss of the potable water system will not result in reactor trip or immediate shutdown need.

44 Building Heating System Operating Loss of the Building heating system will not induce any reactor trip or immediate shutdown.

59 Demineralized Water System Operating 500,000 Small bore pipes Loss of the Demineralized Water System wil! not induce any reactor trip or immediate shutdown.

62 Chemical Volume and Control System Operating Letdown orifices limit flow rate to 75 gpm in the section upstream of the VCT.

Loss of any portion of the purifi cation/charging portion of the CVCS, including seal injection, is expected to induce an initiating event.

Loss of the portion of the CVCS outside the purification/charging loop is not expected to induce any plant trip or forced shutdown.

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Table System System rOperatingl Standby lnventory

{uall Gommenta 63 Safety lnjection System Standby 380,000 Loss of one train of Safety lnjection System is not expected to induce a forced shutdown. LCO 3.5.2 allows for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to re-align the unavailable train of Emergency Core Cooling System (ECCS). A break in the SIS line that has the potential for significant depletion of the RWST will result into entering TechSpec 3.5.4, which will require immediate action.

lmmediate shutdown of the reactor is postulated.

67 Essential Raw Cooling Water System Operating lnfinite Loss of either one train of ERCW would result in a reactor trip consistent with lE o/oIPLERCW,

%2PLERCW and

%OTLERCW.

70 Component Cooling System Operating 500,000 Limited auto-makeup from Demineralized Water Storage Tank.

Loss of either one train of CCS would result in a reactor trip.

72 Containment Spray System Standby 380,000 Loss of one train of Containment Spray System is not expected to induce a forced shutdown. LCO 3.6.6 allows for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to re-align the unavailable train of CSS. A break in the CSS line that has the potentia! for significant depletion of the RWST will result into entering TechSpec 3.5.4, which will require immediate action.

lmmediate shutdown of the reactor is postulated.

74 Residual Heat Removal System Standby 380,000 Loss of one train of RHR is not expected to induce a forced shutdown. LCO 3.5.2 allows for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to re-align the unavailable train of ECCS.

A break in the RHR line that has the potential for significant depletion of the RWST will result into entering TechSpec 3.5.4, which will require immediate action.

lmmediate shutdown of the reactor is postulated.

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System System Opefatingl Standbv 78 Spent Fuel Pool Cooling System Operating 53,300 Loss of the SFPCS is not expected to induce reactor trio or immediate shutdown.

Reference 39, Table 4-9

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Table 41 -- Sample Propagation Path Galculation Flood Area of Source 786.0-Al Leak Rate (gpm) 2000.00 1

Break occurs.

786.0-A1 N/A 0.00 Sprav 0.00 0.00 0.00 2

From room 786.0-A1, water flouus. thtough an open space and stair fZ and dorn to rupm 757.0-A13.

786.0rA1 N/A 0.,00 0.00

,i 0.00 0.00 0.00 3

From room 757.A-413, water propagates down the qrid and into room 737.0-41.

7s7.0-413 12400 0.00 0.00 0.00 0.00 0.00 4

From room 737,0-A1, water propagates down the orid and into ftxlm 713.0-41.

737.0=,Al 15072 0.$t) 0.00 0.00 0.00 0.00 5

From room 713.0-41, water propagates down the orid and into flood area 692.0-A0.

713.0-A1 1 654 0.00 0.00 0.00 0.00 0.00 o

From room 692,0-A0, water propagates down:the srid and into flood area 676.0-A0.

699.0-41, A27. A4 N/A 0.00 0.00 0.00 0.00 0.00 7

Water flows through wiremesh doors A7 and A15 and fills rooms 674.0-41 and 674.A-M to a height of 2 feet.

674.0-41 1 335 2.00 674.0-42 2U 2.00 Sum of sfep.'

1 569 2.00 2U72.24 0.20 0.20 I

Water rises 3.5 inches to reach he curb height arcund the grid. When this occurs, water can fiow doriln the grid to 866.0-A0.

674.0-Al 1335 2.29 6?4.0-A2 2#

2.29 676.0-A1, A5. A6 0.2s Sumof sfeo:

47ffi 0.2s 0.09,'

0.28.

I Water flows into 666.0-A0, which can hold 210000 qallons.

666.0-A0 Grid 21 0000.00 1.75 2.03 10 See Sec*ion 4,4.2.L 't for further propagation after the passive sump overflows.

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Table 42.. Qualitative Screening Assessment of Flooding Sources, Auxiliary Building

@fIT\\F Jtsl Acrobat Oocunent Table 43 - Qualitative Screening Assessment of Flooding Sources, Contro!

Building EI" L

4rv

.,rLila Acrobat Docunrent Table 44.. Qualitative Screening Assessment of Flooding Sources, Diesel Generator Building q

2r

{-t Acrobat ooir*nt Table 45 - Qualitative Screening Assessment of Flooding Sources, Intake Pumping Station I

L\\,

d*L Acrobat Docunrent Table 46 - Qualitative Screening Assessment of Flooding Sources, Turbine Building It Acrobat Docunrent Reference 39, Tables 4-57, 4-63, 4-65, 4-66, 4-67.

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Tahle 4T' '-- {Not U The information previously provided in this table resides in Table 5-1 of the lnternal Flooding Notebook (MDN-000-ggg-ZOOg-Ot+6, Ref 39).

The information previously provided in this table resides in Table 5-10 of the lnternal Flooding Notebook (MDN-000-999-2008-0146, Ref 39).

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The information previously provided in this table resides in Table 5-15 and Table 5-18 of the lnternal Flooding Notebook (MDN-000-999-2008-0146, Ref 39).

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Table 50 -- Sample Internal Flooding Walkdown Data Sheet Calculation No. MDN-000-999-2008-01 48 Rcv: 002 PIANT: WBN Subleet:

WBN Probahilistie Rislr Assessment - lnternal Flooding Analyeis Noteboolr 67{.0.A{ - Woate hold uo tcnk rsom Drawng: 46W401-4 Rev.7 Free floor area {ff !: 1335 {WBN-OSG-4S9g Rev.S. trag. B1-5}

Flood indicatore: None Notes and Reierences:

Gnerrl inlormston from WBN-OS&,4099 Rev.8. Poge Bl-5. Oraln lnformeton from l-{7W852-l (D-'to: 3" FD LOC Ag ( W} and trom 47'./fr4?g-l Rcv,i i.

Wdhdolfln notas:

Not rccersibL iRAOCON iimliltiofirl. Thc trr.m.ri door wa3 ob.cn c{t trsm room 6?8.0-At.

Oool9 in rmm:

Door lB Frorn Room To Roorn Door Tvoe Door Size Curtl Gao wBn-o-oooR41s-A007 676 0-A1 674.0-A1 trTiremeeh Srnole None N,A Floor drarne in roorn:

I Drarn Size I

]il I

No floor penetrauons prescnt in th*s roorn.

No wall penetrations present Un fiis room.

No srgnrficant components present in this room.

Potential sourceg in roorn:

Source lD Phvsicsl Drawino Flour Diacrern Source Descriobon Temperature and Preseure WBN.O-TANK.

0774002 47W560-?5.Rev.4 147W830-!

Rev^34 Waste Dieposal System (gy3t 77) Trirrated Draln Collector Tanh 50-140 deg F, Atnrosphenc (N3-77A-4001C Rev I tabie 9.5) 674-41-77-01 47W560-25 Rev 4 1-+71V830-l Rev.33 Waste Dieposal Syetem {$yrf. 77} prping - mar 8" O header to the Tritrated Drain Corlector Tenk 50-140 deg F, Atmosphenc (N3-77A,+001C Rev.Q, tEble Q.5. value forI'rlfiatsd Draln Coliector Tank) 674-A1-13-01 Frorn MELE - WBN-OSG-4099 Rev.B. Paoe B1-s NTA Auxiliary Eoiler Syatern ($yrt. 12) piprng - J" 6 lrre NIA

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Table 51 WBN U1 U2 Flood - NEW.caf lntegrated fault tree model, including flooding initiating events. There is a gate for CDF (Ux_CDF) and a gate for LERF (Ux_L2LERFTOP) for each unit at WBN. Gate Ux_MUX provides logic for most mutually exclusive events.

WSBN2 - NEW.rr Master database.

CAFTA.INI lnitialization file for CAFTA 5.4.

QUANTI FI ERSETTI NGS. I N I Quantifier confi guration settings.

MUX.txt Master mutually exclusive event file, for mutually exclusive events not modeled within the integrated fault tree.

FLAGSettings.TXT Master flag file.

RecruleCDF.txt Recovery rule file for CDF quantification.

RecruleLERF.txt Recovery rule file for LERF quantification.

RECFlLE.caf Level 1 recovery fault tree, called from the recovery rule files.

U1-12-rec.caf haosbf RECFlLE.caf Unit 1 Level 2 recovery fault tree, called from the recovery rule files.

U2-12-rec.caf Unit 2 Level 2 recovery fault tree, called from the recovery rule files.

WBNUl-U?CDF.qnt WBNUl-U2LERF.qnt These are the quantification files for the integrated WBN model.

CN_RAM_09_0 1 g_MC 1 3.xmcd CN_RAM_09_019.xmcd This is a Mathcad file, saved in 2 formats, that performs the electric power recovery convolution analysis. The title MC13 refers to Mathcad version 13.

U1-CDF.CUT U2-CDF.CUT U1-LERF.CUT U2 LERF.CUT cutset files for CDF and LERF for each unit.

SYSIMP This folder contains the files used to generate component and system importance values

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$ofrurare Package Vercion Description CAFTA 5.4 Computer Aided Fault Tree Analysis System PRAQuant 5.1 PRAQuant Accident Sequence Quantification FTREX 1.6.0.1 Fault Tree Reliability Evaluation eXpert HRA Calculator 4.2.1 Human Reliability Analysis Calculator MAAP 4.0.5 4.0.7 Modular Accident Analysis Program. Version 4.0.5 was used for Leve!

1. Version 4.0.7 was used for Level 2.

UNCERT 3.0 Unceftainty Analysis SYSIMP 2.1 lmportance Calculator Xlnit 1.1b Flooding logic rule file MathCad 14 Electric Power Recovery Convolution Analysis

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Table 53 - (Not Used)

All Finding Level F&Os have been addressed for the Capability Category !! level.

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Unit 2 Truncaffon CDF (per reactor-year) 1.39E-05 1.43E-05 1.00E-13 Cutsets for CDF 553,634 529,092 LERF (per reactor-year) 1.12E-06 1.16E-06 3.00E-13 Cutsets for LERF 74,798 82,920

References:

CDF and LERF values from Reference 44, Section 5.0. The numbers of cutsets are from the cutset files.

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Table 55 -- GDF Results By Accident Sequence for Unit t Percent Contribution Accident Sequence Accident Sequense, Failurss 4.4804 GTRAN-011 GENERAL TRANSTENT SEQUENCE 11 (AFW. BFCH) 4.47ot6 GTRAN-OO3 GENERAL TRANSIENT SEQUENCE 3 (LTHR, HPRCH) 4.47ot6 GTRAN.OlO GENERAL TRANSIENT SEQUENCE 10 (AFW, HPRCH) 4.42o/o GTRAN-006 GENERAL TRANSIENT SEQUENCE 6 ( LTHR, CVCS, HpRSt) 4.4L96 GTRAN.O13 GENERAL TRANSTENT SEQUENCE 13 (AFW, CVCS, HpRSt) 4.3996 GTRAN-OO7 GENERAL TRANSTENT SEQUENCE 7 (LTHR, CVCS, BFSI) 4.39o/o GTRAN -OL4 GENERAL TRANSTENT SEQUENCE 14 (AFW, WCS, BFSl) 4.3804 GTRAN-OO8 GENERAL TRANSTENT SEQUENCE 8 (LTHR, CVCS, SI) 4.3804 GTRAN-015 GENERAL TRANSTENT SEQUENCE 15 (AFW, St, CVCS) 4.Lso/o sLocA-o15 SMALL LOCA SEQUENCE 15 (CVCS, HpRSt, LpR) 4.L0oft sLocA-023 SMALL LOCA SEQUENCE 23 (CVCS, St, LpR) 4.Ogg5 GTRAN-OO4 GENERAL TRANSIENT SEQUENCE 4 (LTHR, BFCH}

4.OgYo sLocA-005 SMALL LOCA SEQEUENCE 5 (HPRCH, LpR, MUSL) 4.0604 sLocA-024 SMALL LOCA SEQUENCE 24 (gtCS, St, Lpt) 2.9Lot6 SLOCAV-OO3 VERY SMALL LOCA SEQEUNCE 3 (LTHR, HPRCH) 2.9Lot6 SLOCAV-OO4 VERY SMALL LOCA SEQUENCE 4 (LTHR, BFCH) 2.9L?6 sLocAV-o11 VERY SMALL LOCA SEQUENCE 11 (AFW, BFCH) 2.gLoA SLOCAV-OT4 VERY SMALL LOCA SEQUENCE 14 (AFW, q/CS, BFSI) 2.90ot6 SLOCAV-O10 VERY SMALL LOCA SEQEUENCE 10 (AFW, HPRCH) 2.9096 sLocAV-007 VERY SMALL LOCA SEQUENCE 7 (LTHR, CVCS, BFSI) 2.900,/6 sLocAV-005 VERY SMALL LOCA SEQUENCE 6 (LTHR, CVCS, HpRSt) 2.9004 sLocAV-o13 VERY SMALL LOCA SEQUENCE 13 (AFW, o/CS, HpRSt) 2.88?6 SLOCAV-OO8 vERy SMALL LOCA SEQUENCE I (LTHR, CVCS, SI) 2.88Yo SLOCAV-o15 vERy SMALL LOCA SEQEUNCE 15 (AFW, ffCS, S!)

L.240,4 sLocA-007 SMALL LOCA SEQUENCE 7 (HPRCH, AFW3, MUSL) o.770fi sLocA-002 SMALL LOCA SEQUENCE 2 (LTHR) 0.760,4 sLocA-004 SMALL LOCA SEQUENCE 4 (HPRCH, LTHR) o.760,4 sLocA-009 slocA SEQUENCE 9 (AFW, HPRCH) 0.760,4 sLocA-o10 sLocA SEQUENCE 10 (AFW, HPR) o.75o,4 sLocA-020 SMALL LOCA SEQUENCE 20 (CVCS, AFW, BFSl) 0.7604 sLocA-o14 SMALL LOCA SEQUENCE 14 (CVCS, HPRSI, LTHR) 0.760,4 slocA-o19 SMALL LOCA SEQUENCE 19 (CVCS, AFW, HpRSt) 0.760,4 sLocA-022 SMALL LOCA SEQUENCE 22 (gtCS, St, LTHR) 0.75o,4 sLocA-oI2 SMALL LOCA SEQUENCE 12 (CVCS, LTHR) 0.75o/o sLocA-026 SMALL LOCA SEQUENCE 25 (CVCS, St, AFW) 98.L5%

Tota!

Note: Unit 2 simi ar.

Reference 44, Section 5.2

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> 10-o 2

18.00%

10-' to 10-"

16 27.40o/o 10-o to 10-'

75 13.90%

10-' to 10-o 900 15.80%

1 0- to 10-'

4,699 9.30%

10-" to 10-

28,1 65 5.70o/o 1 0- lo 10-' '

114,097 2.40o/o Note: Unit 1 similar

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Table 57 - Top 100 Gutsets for Unit 1 CDF

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Table 58 - Top 100 Cutsets for Unitz CDF

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Table S9,- GDF By lnitiator for Unit I GDF (per reactor-year)

Percent Gontribution 1.71E-06 12.28o/o Loss of Offsite Power (Grid Related) 1.65E-06 11.85o/o Total Loss of Component Cooling System Unit 1 1.47E-06 10.57%

Loss of Offsite Power (Plant Centered) 1.39E-06 9.98%

Small LOCA Stuck Open Safety Relief Valve 1.29E-06 9.24o/o Flood event induced by RCW rupture in 772.0-A8 1.29E-06 9.24o/o Flood event induced by RCW rupture in 772.0-A9 1.08E-06 7.730/o Total Loss of ERCW 5.52E-07 3.97o/o Loss of Offsite Power (Weather lnduced) 3.43E-07 2.47o/o Flood event induced by HPFP break tn 757.0-M 2.57E-07 1.85o/o Flood event induced by HPFP break in 757.0-M4 2.06E-07 1.48o/o Loss of Battery Board 2 1.90E-07 1.360/o Flood event induced by RCW rupture in 757.0-A17 1.90E-07 1.36%

Flood event induced by RCW rupture in 757.0-Ag 1.71E-07 1.23o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG3 1.71E-07 1.23%

SECONDARY BREAK OUTSIDE CONTAINMENT SG4 1.71E-07 1.23o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG1 1.71E-07 1.23o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG2 1.30E-07 0.94o/o Flood event induced by HPFP break in 757.0-A5 1.17E-07 0.84o/o Loss of Component Cooling System Train 1A 1.01E-07 0.72o/o Flood event induced by HPFP break in 757.0-A21 9.74E-08 0.70o/o Turbine Trip 9.68E-08 0.70o/o Flood event induced by HPFP break in 772.0-A7 9.63E-08 0.69%

Reactor Trip 9.42E-08 0.68%

Flood event induced by HPFP break in 772.0-A10 6.14E-08 0.44o/o SLOCA ON COLD LEG 1

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Table 59 -- CDF By lnitiatoi SEr Unit t CDF (per reactor-year)

Percent Gontribution Initiating Euent I

6.14E-08 0.44o/o SLOCA ON COLD LEG 2 6.14E-08 0.44o/o SLOCA ON COLD LEG 3 6.14E-08 0.44o/o SLOCA ON COLD LEG 4 5.69E-08 0.41o/o Major flood in the Turbine Building 5.19E-08 0.37o/o Partial Loss of Main Feedwater 4.84E-08 0.35%

Total Loss of Main Feedwater 4.58E-08 0.33%

Partial Loss of ERCW UNIT 1 3.84E-08 0.28o/o lnadvertent Closure of 1 MSIV 2.94E-08 0.210/o EXCESSIVE LOCA (VESSEL RUPTURE) 2.74E-48 0.20o/o Loss of Battery Board 1 2.51 E-08 0.18o/o Loss of 120V AC Vital lnstrument Board I 2.39E-08 0.17%

Spray event on dryers 2.33E-08 0.17o/o Loss of Condenser Vacuum 1.39E*0S TOTAL Reference 44, Table 5.3-1

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Table 60 -- Unit,I CDF (oer reactor-vear)

Difference lnitlatlns Event CAFTA R{

CAFTA RO 2.39E-08 6.28E-10 3704o/o Spray event on dryers 2.57E-07 1.07E-07 140o/o Flood event nduced bv HPFP break n 757.0-A24 1.30E-07 5.44E-08 140%

Flood event nduced bv HPFP break n 757.0-A5 1.01E-07 4.21 E-08 139o/o Flood event nduced bv HPFP break n 757.0-421 9.42E-08 3.94E-08 139o/o Flood event nduced bv HPFP break n 772.0-A10 9.68E-08 4.05E-08 139%

Flood event nduced bv HPFP break n 772.0-A7 3.43E-07 1.44E-07 138o/o Flood event nduced bv HPFP break n 757.0-A2 6.14E-08 2.62E-08 134o/o SLOCA ON COLD LEG 1 6.14E-08 2.62E-08 134o/o SLOCA ON COLD LEG 2 6.14E-08 2.62E-08 134o/o SLOCA ON COLD LEG 3 6,14E-08 2.62E-48 134o/o SLOCA ON COLD LEG 4 3.84E-08 1.70E-08 1260/o lnadvertent Closure of 1 MSIV 1.39E-06 6.93E-07 100%

Small LOCA Stuck Open Safetv Relief Valve 1.90E-07 1.27E-07 49o/o Flood event nduced bv RCW rupture in 757.0-A17 1.90E-07 1.27E-07 49o/o Flood event nduced bv RCW rupture in 757.0-Ag 1.29E-06 1.06E-06 21o/o Flood event nduced bv RCW rupture in 772.0-AB 1.29E-06 1.06E-06 21o/o Flood event nduced bv RCW rupture in 772.0-Ag 1.08E-06 9.67E-07 11o/o Total Loss of ERCW 1.17E-07 1.13E-07 3o/o Loss of Component Coolinq Svstem Train 1A 1.65E-06 1.64E-06 1o/o Total Loss of Component Coolinq Svstem Unit 1 2.06E-07 2.298-07

-10%

Loss of Battery Board 2 1.71E-07 2.44E-07

-30%

SECONDARY BREAK OUTSIDE CONTA NMENT SG 3 1.71E-07 2.44E-07

-30%

SECONDARY BREAK OUTSIDE CONTA NMENT SG 4 1.71E-07 2.44E-07

-30o/o SECONDARY BREAK OUTSIDE CONTA NMENT SG 2 1.71E-07 2.44E-07

-30%

SECONDARY BREAK OUTSIDE CONTA NMENT SG 1 2.51 E-08 4.15E-08

-39o/o Loss of 120V AC Vital lnstrument Board I 4.84E-08 9.45E-08

-49%

Total Loss of Main Feedwater 1.47E-06 2.97E-06

-50Yo Loss of Offsite Power (Plant Centered) 1.71E-06 3.46E-06

-51o/o Loss of Offsite Power (Grid Related) 5.52E-07 1.13E-06

-51%

Loss of Offsite Power (Weather lnduced) 9.63E-08 2.10E-07

-54%

Reactor Trip 9.74E-08 2.67E-07

-64o/o Turbine Trip 2.74E-08 7.94E-08

-66%

Loss of Battery Board 1 5.19E-08 1.67E-07

-69%

Partia! Loss of Main Feedwater 2.94E-08 1.00E-07

-71o/o EXCESSIVE LOCA UESSEL RUPTURE) 2.33E-08 8.79E-08

-73o/o Loss of Condenser Vacuum 5.69E-08 2.24E-07

-75o/o Maior flood in the Turbine Buildinq 4.58E-08 3.44E-07

-87o/o Partial Loss of ERCW UNIT 1 1.39E-05 1.82E-05

-24o/o TOTAL

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Table 6I *- GDF By lnitiator f6r Unit 2 GDF (per reactor-year)

Percent Gontribution lhitiating Euent 1.67E-06 11.72o/o Loss of Offsite Power (Grid Related) 1.65E-06 11.53o/o Total Loss of Component Cooling System Unit 2 1.44E-06 10.11o/o Loss of Offsite Power (Plant Centered) 1.36E-06 9.540/o Small LOCA Stuck Open Safety Relief Valve 1.29E-06 9.00%

Flood event induced by RCW rupture in 772.0-A8 1.29E-06 9.00%

Flood event induced by RCW rupture in 772.0-A9 1.13E-06 7.90o/o Total Loss of ERCW 5.51E-07 3.85%

Loss of Offsite Power (Weather lnduced) 4.41E-07 2.81o/o Partial Loss of ERCW UNIT 1 3.43E-07 2.40o/o Flood event induced by HPFP break in 757.0-A, 2.57E-07 1.80o/o Flood event induced by HPFP break in 757.0-A24 1.90E-07 1.33o/o Flood event induced by RCW rupture in 757.0-A17 1.90E-07 1.33o/o Flood event induced by RCW rupture in 757.0-Ag 1.79E-07 1.25o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG 1 1.67E-07 1.17o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG 2 1.67E-07 1.17o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG 3 1.67E-07 1.17o/o SECONDARY BREAK OUTSIDE CONTAINMENT SG 4 1.30E-07 A.91o/o Flood event induced by HPFP break in 757.0-A5 1.238-07 0.86%

Reactor Trip 1.23E-07 0.86%

Loss of Battery Board 4 1.17E-07 0.82o/o Turbine Trip 1.01E-07 0.70o/o Flood event induced by HPFP break in 757.0-A21 9.97E-08 0.70o/o Major flood in the Turbine Building 9.68E-08 0.68%

Flood event induced by HPFP break tn 772.0-A7 9.42E-08 0.66%

Flood event induced by HPFP break in 772.0-A10 8.51E-08 0.60%

Loss of Component Cooling System Train 2A 6.25E-08 0.44%

Partial Loss of Main Feedwater 6.03E-08 0.42o/o SLOCA ON COLD LEG 1

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Table 61 -- CDF By lnitiator for Unith GDF (per reactor-year)

Percent Contribution lnitiating Event 6.03E-08 0.42o/o SLOCA ON COLD LEG 2 6.03E-08 0.42o/o SLOCA ON COLD LEG 3 6.03E-08 0.42o/o SLOCA ON COLD LEG 4 5.73E-08 0.40o/o Total Loss of Main Feedwater 4.92E-08 A34o/o lnadvertent Closure of 1 MSIV 3.02E-08 0.210/o Loss of Battery Board 3 2.94E-08 0.21o/o EXCESSIVE LOCA (VESSEL RUPTURE) 2.91 E-08 0.20o/o Spray event on dryers 2.86E-08 0.20o/o Loss of Condenser Vacuum 2.49E-08 0.17o/o FIood event induced by unisolated ERCW break at EL 676' of AB 1.43E*05 TOTAL Reference 44, Table 5. 3-2

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ITEM RAW FV RRW BB u1sYs082 260.94L7A 1.30E-01 L.L4954 3.52E-03 u1sYS030 875.64820 1.17E-01 L.L32875 L.22E-02 u2sYs082 42.70378 7.92E-O2 1.09596 5.81E-04 U 1SYSOO3 2487.45100 6.78E-O2 L.O727L 3.46E-02 UOSYS236 7L749.02000 4.59E-O2 1.048115 9.98E-01 U1SYSO62 15.15365 4.50E-02 L.O47L5 2.L2E-O4 u2sYs030 42.70050 3.29E-O2 L.034024 5.81E-04 U1SYSO58 46.83577 3.18E-02 1.032853 6.38E-04 uosYs067 497L6.41000 2.L9E-O2 L.022442 6.78E-01 U1SYSOTO 35727.43000 2.02E-02 1.020567 4.97E-OL U1SYSZLL 30497.04000 1.55E-02 L.0L5728 4.24E-OL U 1SYSO85 6754.30500 1.16E-02 1.011709 9.39E-02 u1sYs2L2 L7757.72000 8.59E-03 1.009667 2.47E-OL u2sYs058 L.L4707 8.25E-03 1.008319 2.15E-05 UOSYS026 2.49869 6.65E-03 1.006699 2.09E-05 U2SYSZLL 43.19505 5.29E-03 1.005317 5.87E-04 UlSYSO74 70.68874 5.25E-03 1.005299 9.69E-04

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Tahle 63 -- Unit I lTEIl,l RAW FV RRW BB uosYs235 205183.80000 4.15E-03 1.004181 2.87E+00 uosYs236 7L749.02000 4.59E-02 1.048116 9.98E-01 uosYS067 48716.41000 2.L9E-02 L.022442 5.78E-01 u 1sYso70 35727.43000 2.02E-02 L.020567 4.97E-OL U1SYSZLL 30497.04000 1.55E-02 L.OL572g 4.24E-OL u 1sYS099 26357.55000 3.94E-03 1.003954 3.57E-01 U1SYS2L2 L7757.72000 8.59E-03 1.009567 2.47E-OL u 1sYS085 6754.30500 1.16E-02 1.011709 9.39E-02 u0sYS032 2670.98400 9.44E-04 1.000945 3.7LE-Oa u1sYS003 2487.45100 6.78E-A2 L.O727L 3.45E-02 u 1sYs001 2306.86200 3.42E-05 1.000034 3.2LE-O2 U 1SYSO3O 875.64920 1.17E-01 L.L32875 L.22E-O2 uosYs070 840.37300 4.60E-04 1.00045 L.L7E-Oz u1sYs2L4 420.06960 2.90E-03 1.002903 5.83E-03 U1SYS2L3 36L.71610 5.56E-04 1.000557 5.02E-03 u 1sYs063 360.15090 3.28E-03 1.003293 5.00E-03 U 1SYSO82 260.94L70 1.30E-01 I.L4g54 3.62E-03 u1sYso74 70.69974 5.26E-03 1.005289 9.59E-04 u 1sYs068 46.83577 3.18E-02 1.032953 5.38E-04 uosYs226 45.29920 7.4LE-05 1.000074 6.15E-04 U2SYSzLL 43.19505 5.28E-03 1.005317 5.87E-04 u2sYso82 42.70379 7.92E-O2 1.09596 5.81E-04 u2sYs030 42.70050 3.29E-02 L.034024 5.81E-04 U2SYS2L2 28.76819 2.58E-04 1.000259 3.85E-04 U 1SYSO62 15.16365 4.50E-02 L.O47L5 2.L2E-O4 U 1SYSO18 15.83739 u2sYso70 L2.28963 2.42E-O4 r.ooa242 L.57E-O4 u0sYs200 9.34536 1.05E-03 1.001053 1.16E-04 u 1sYs002 6.26467 1.82E-03 1.001925 7.33E-05 U2SYSO18 4.463LL uosYs026 2.49969 6.65E-03 1.005599 2.09E-05 U 1SYSO3 1 2.38972 u1sYs278 2.2g6Lg 4.97E-O6 1.000005 1.79E-05

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Table 64 -- Unatz System lmportance for GDF, F-V t[5%

Item RAW FV RRW BB u2sYs082 25L.47360 1.31E-01 1.150446 3.58E-03 u2sYs030 828.52810 1.12E-01 L.L25782 1.18E-02 u 1sYS082 42.94064 7.07E-O2 L.O76LL7 5.00E-04 u2sYs003 24L4.75300 6.77E-02 L.072606 3.45E-02 u2sYS068 76.20969 4.65E-02 L.O48722 1.08E-03 u2sYs062 15.30373 4.37E-O2 L.045723 2.05E-04 uosYs067 47394.97000 4.10E-02 L.042745 6.77E-OL u1sYs030 4294064 3.04E-02 1.03133 5.00E-04 u2sYs085 9L21.34300 L.79E-O2 1.019252 1.30E-01 uosYs236 59865.05000 L.72E-O2 1.017536 9.98E-01 U2SYSzLL 18874.99000 L.45E-O2 I.OL4764 2.70E-Or u2sYS070 34630.84000 L.34E-02 1.013509 4.95E-01 UOSYS026 2.79627 r.o7E-oz 1.010831 2.58E-05 U1SYSZLL 49.47345 5.81E-03 1.00584 6.93E-04 u2sYS099 28696.71000 5.49E-03 1.005522 4.10E-01 U2SYS2L2 17144.07000 5.22E-03 1.005243 2.45E-01

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Table 65 -- Unit 2 System Importance for CDF, RAW > 2 Item RAW FV RRW BB u0sYs235 20a642.50000 4.04E-03 1.004061 2.87E+00 uosYs236 69865.05000 L.72E-02 1.017536 9.98E-01 uosYs067 47394.97000 4.10E-02 L.042745 6.77E-OL u2sYso70 34530.94000 L.34E-02 1.013609 4.95E-01 u2sYS099 28696.71000 5.49E-03 1.005522 4.10E-01 U2SYSzLL L8874.99000 1.45E-02 L.0L4764 2.70E-OL u2sYs2L2 L7L44.07000 5.22E-03 1.005243 2.45E-01 u2sYs08s 9r2L.34300 L.79E-O2 1.018252 1.30E-01 uosYso32 2594.22000 4.82E-04 1.000482 3.70E-02 u2sYs003 24L4.75300 6.77E-02 L.O72606 3.45E-02 u2sYS001 2247.34800 3.31E-05 1.000033 3.2LE-02 uosYS070 L604.427AO 2.53E-04 1.000253 2.29E-O2 u2sYs030 828.62910 1.12E-01 L.L25782 1.18E-02 U2SYS2L4 377.59340 4.99E-03 1.00502 5.38E-03 u2sYs063 352.7722A 3.20E-03 1.003213 5.03E-03 U2SYS2L3 349.51790 4.49E-O4 1.000449 4.95E-03 U2SYSO82 25L.47360 1.31E-01 1.150445 3.58E-03 u2sYs058 75.20959 4.55E-02 L.049722 1.08E-03 u2sYso74 69.A4472 4.95E-03 1.00499 9.72E-A4 U1SYSaLT 49.47345 5.81E-03 1.00584 5.93E-04 u1sYs030 42.94064 3.04E-02 1.03133 5.00E-04 u 1sYs082 42.94064 7.07E-O2 r.o76Lr7 6.00E-04 u0sYs030 18.37522 1.13E-03 1.00113 2.488-04 u2sYs018 18.35087 u2sYsa62 15.30373 4.37E-Oz r.045723 2.05E-04 u1sYso70 L2.69239 3.17E-03 1.003183 r.67E-O4 UOSYS226 4.50942 5.98E-05 1.000006 5.01E-05 u 1sYs018 4.24966 u0sYs200 2.92069 1.94E-04 1.000194 2.74E-O5 uosYS026 2.79627 L.07E-02 1.010831 2.58E-05 u2sYs031 2.30555 u2sYS278 2.2094L 4.39E-05 1.000004 1.73E-05

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SUMMARY

Tabl$$.- Uni!,{, c-omponent tmportane&iryfl.

Item RAW FV RRW BB WBN-I-G EN -082-0001A -A 24.gg3gL 5.84E-02 L.062046 3.35E-04 WBN-I-PMP -003-0001A -S 5.55050 4.L4E-O2 1.043L97 5.40E-05 WBN-I-GEN -082-00018 -B 13.90007 3.52E-O2 1.03649 1.80E-04 WBN-I-FAN -030-0459 -A 24.9938L 2.28E-O2 1.02338 3.34E-04 WBN-I-FAN -030-0183 6.34303 r.70E-02 L.OL73LL 7.46E-O5 WBN-I-RFV -062-0536 -S 6.41593 L.40E-O2 L.OL4aAL 7.55E-05 WBN-o-BD -235-0002 -E 38.35105 L.40E-O2 1.014193 5.20E-04 WBN-I-FAN -030-0451 -B 13.90007 L.40E-02 1.014195 1.80E-04 wBN BKR -2LL-L7 L6 I L6 -A 31.82L23 8.12E-03 1.009199 4.29E-O4 WBN-I-FAN -030-0214 2.06351 6.50E-03 1.005545 1.49E-05 WBN-I-FAN -030-0447 -A L.7g2g0 6.00E-03 1.005035 1.10E-05 WBN-I-FAN -030-0451 -A L.782gO 6.00E-03 1.006035 1.10E-05 WBN-0-PMP -070-0051 -S L6.87529 5.93E-03 1.00597 2.2LE-O4 WBN-I-RFV -058-0553 7.7854L 5.30E-03 1.005325 9.45E-05 WBN-I-RFV -058-0554 7.7854L 5.30E-03 1.005325 9.45E-05 WBN-I-RFV -058-0555 7.7854L 5.30E-03 1.005325 9.45E-05 WB N-I-BKR -2LL-L7 2SI L6 -B 38.28581 5.14E-03 1.005159 5.19E-04

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page: 164

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Item RAW FV BB WBN-1.BD -211-A -A 257.74650 2.10E-03 1.002104 3.57E-03 WBN-I-STN -063-0200 225.7A350 2.25E-03 r.402254 3.13E-03 wBN-o-cKV -057-0503D -A LL7.20490 3.92E-04 1.000392 1.62E-03 wBN-o-cKV -057-05038 -A tL7.20480 3.92E-04 1.000392 1.62E-03 WBN-I-BD -2L2-A001 -A 105.18990 1.08E-03 1.001095 1.45E-03 WBN-I-BKR -2L2-A00U1B -A 105.18990 4.25E-04 1.000425 1.45E-03 WBN-I-BKR -2L2-A1 -A 105.19990 4.25E-04 1.000425 1.45E-03 WBN-1-OXF -2L2-A001 -A 105.18990 2.26E-03 L.OO227 1.45E-03 wBN-o-cKV -057-0503 H -B 95.59701 6.37E-04 1.000637 1.33E-03 wBN-o-cKV -067-0503F -B 96.59575 5.35E-04 1.000636 1.33E-03 WBN-I-BD -2L2-A002 -A 86.99751 8.94E-04 1.000895 1.20E-03 wB N B KR -2L2-AOO2( LB -A 86.99751 3.51E-04 1.000351 1.20E-03 WBN-I-BKR -2L2-A2 -A 85.99751 3.51E-04 1.000351 1.20E-03 WBN-I-OXF -2L2-A002 -A 85.99751 1.86E-03 1.001859 1.20E-03 ESFAS CABINETS U1 54.9L207 5.52E-04 1.000552 7.50E-04 WBN-o-BD -235-0001 -D 45.45874 1.94E-03 1.001939 6.18E-04 WBN-I-FCV -057-0127 -A 42.60125 4.42E-O7 1

5.79E-04 WBN-I-FCV -057-0022 -A 42.r7599 4.28E-07 L

5.73E-04 WBN-I-FCV -057-0081 -A 42.L7599 4.28E-07 L

5.73E-04 wBN-l-tSV -057-0505A -A 42.17599 4.29E-07 L

5.73E-04 WBN-o-BD -235-0002 -E 38.35105 1.40E-02 1.014193 5.20E-04 WBN-I-B KR -2Lr-r7281 L6 -B 38.29591 5.14E-03 1.005159 5.19E-04 WBN-I-BD -211-8 -B 37.85910 3.21E-04 1.000321 5.13E-04 wB N B KR -236-00 OL/ 226-D 36.9LL67 L.42E-04 1.000142 5.00E-04 wBN-o-cH G R-236-0001 -D 36.91L67 4.38E-03 1.004403 5.00E-04 WBN-o-FU -235-0001 l2L0-D 36.91L67 1.07E-04 1.000107 5.00E-04 wBN -o-sw -235-000usw1-s 36.91167 L.42E-04 1.000142 5.00E-04 WBN-I-B KR -2LL-L7 L6l L6 -A 3L.82L23 8.12E-03 1.008189 4.29E-O4 WBN-I-FAN -030-0459 -A 24.9939L 2.28E-O2 1.02339 3.34E-04 wBN-r-G EN -082-0001A -A 24.99381 5.84E-02 1.052046 3.35E-04 WBN-I-FCO -030-0443 -A 24.944L5 3.20E-03 1.003207 3.33E-04 WBN-I-FCO -030-04s9 -A 24.944L5 3.20E-03 1.003207 3.33E-04 WBN-I-TANK-063-0046 2L.99279 1.00E-05 1.000001 2s2E-O4 WBN-I-BD -235-0001 -D L7.6L254 1.46E-03 1.001453 2.31E-04 WBN-I-XSW -235-0001 -D L7.6L254 5.55E-04 1.000557 2.31E-04 WBN-I-SW -235-0001 -D L7.27349 6.L7 E-05 1.000062 2.26E-O4 wBN-o-cKV -070-0504 16.87529 4.74E-O5 1.000047 2.2LE-O4 WBN-0-PMP -070-0051 -S L6.87529 5.93E-03 1.00597 2.2LE-O4 wBN-o-tsv -070-0503 L6.79294 238E-A7 T

2.20E-O4 wBN-o-tsv -070-0505 L6.79294 2.38E-07 1

2.20E-O4

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 165

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Item WBN-o-FCV -067-0L44 -B RAW L6.77487 FV 6.41E-05 RHITTI 1.000006 BB 2.L9E-O4 WBN-0-FCV -070-00L2 -B L6.77487 2.38E-07 L

2.19E-04 WBN-o-FCV -070-0022 -B L6.77487 2.38E-O7 L

2.r9E-04 WBN-o-HTX -070-0186 L6.77487 2.87E-O4 1.000287 2.L9E-O4 wBN-o-rsv -067-L009 -B L6.77487 2.38E-07 L

2.L9E-O4 wBN-o-tsv -057-1010 -B L6.77487 2.38E-O7 L

2.L9E-O4 wBN-o-rsv -070-0510 -B L6.77487 2.38E-07 L

2.L9E-04 WBN-I-BKR -099-11 L6ILB -A 14.93959 5.15E-04 1.000515 1.94E-04 WBN-I-BKR -099-11 L6 I LC -B L4.32052 4.93E-04 1.000493 1.85E-04 WBN-1-FAN -030-0461 -B 13.90007 1.40E-02 1.014185 1.80E-04 WBN-I-G EN -082-00018 -B 13.90007 3.52E-02 1.03648 1.80E-04 WBN-I-FCO -030-0445 -B 13.87302 1.99E-03 1.001992 L.79E-04 WBN-I-FCO -030-0451 -B L3.87302 1.99E-03 1.001992 L.79E-O4 WBN.I-BD -2L2-BOO1 -B 13.59942 L.23E-04 1.000123 1.75E-04 WBN-I-B KR -2L2-BO0U1B -B 13.59942 4.35E-05 1.000044 1.75E-04 WBN-I-BKR -212.81.B L3.59942 4.36E-05 1.000044 1.75E-04 WBN-I-OXF -2L2-8O01 -B L3.59942 2.70E-O4 L.OOO27 1.75E-04 WBN-I-FCV -057-0024 -B L3.21900 3.53E-O7 L

L.70E-04 WBN-I-FCV -067-0082 -B 13.21900 3.53E-07 L

1.70E-04 WBN-I-FCV -057-0128 -B 13.21900 3.53E-07 1

1.70E-04 wBN-l-rSV -057-05058 -B L3.21900 3.53E-A7 1

1.70E-04 wBN-l-rSV -057-05068 -B L3.21900 9.99E-08 1

1.70E-04 wBN-o-rsv -057-0545 -B 12.26727 238E-A7 1

1.57E-04 WBN-I-RFV -070-05518 -B L2.26727 4.84E-05 1.000048 1.57E-04 WBN-I-RFV -070-0ss5B -B L2.26727 4.84E-05 1.000048 L.57 E-04 WBN-I-RFV -070-05518 -B L2.26727 4.84E-05 1.000048 L.57 E-04 WBN-I-RFV -070-05658 -B L2.26727 4.84E-05 1.000048 1.57E-04 WBN-I-RFV -070-05708 -B 12.26727 4.84E-05 1.000048 1.57E-04 WBN-I-BD -2L2-BOO2 -B 11.83511 1.07E-04 1.000107 1.51E-04 WBN-I-BKR -2L2-BOO2l B -A 11.83511 3.92E-05 1.000039 1.51E-04 WBN-I.BKR -2L2-82 -B 11.83511 3.92E-05 1.000039 1.51E-04 WBN-I-OXF -2L2-8O02 -B 11.83511 2.29E-O4 1.000229 1.51E-04 WBN-I-BD -235-0002 -E LL.57498 9.76E-O4 L.OOO977 r.47E-O4 WBN-I-XSW -235-0002 -E LL.574gg 3.60E-04 1.00035 L.47E-O4 WBN-I-B KR -2r2-800u108-B 11.49103 3.80E-05 1.000038 1.46E-04 WBN-1-BKR -214-800u1A1-B 11.49103 3.80E-05 1.000038 1.45E-04 WBN-I-MCC -2L4-8001 -B 11.49103 1.07E-04 1.000107 1.45E-04 WBN-I-SW -235-0002 -E rL.34602 3.85E-05 1.000039 r.44E-O4 WBN-I-FCV -057-0143 -A LL.30402 2.59E-04 1.000269 L.43E-04 WBN-I-FCV -070-0008 -A LL.30402 t.27 E-05 1.000013 L.43E-04 WBN-I-FCV -070-0025 -A LL.30402 L.27 E-05 1.000013 1.43E-04

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 166

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 67.. Unit I Component lmpoilance for CDF' RAW tE Item WBN-1-HTX -070-0185 RAW LL.30402 FV 4.70E-03 RRW L.AO472L BB L.43E-04 wBN-l-lSV -070-0510 -A 11.30402 L.27E-05 1.000013 1.43E-04 wBN-l-lSV -070-0s44A -S 11.30402 L.27E-Os 1.000013 L.43E-04 WBN-I-ISV -070-05 44C -A LL.30402 L.27E-05 1.000013 t.43E-04 wB N B KR -235-00 021 226-E LO.72L67 3.48E-05 1.000035 1.35E-04 wBN-o-cH G R-236-0002 -E L0.72L67 1.19E-03 1.00118 1.35E-04 wB N F U -235-00 02 I ZLO-E LO.72L67 2.58E-05 1.000026 1.35E-04 wBN sw -235-0002/sw l-s LO.72L67 3.48E-05 1.000035 1.35E-04 WBN-o-RFV -070-0527A 10.51405 4.54E-05 1.000045 L.32E-04 wBN-1-tSV -067-1009 10.51405 4.03E-07 L

1.32E-04 wBN-l-tSV -057-1010 10.51405 4.03E-07 L

1.32E-04 WBN-I-RFV -O70-O52L 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-055 1A -A 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-0555A -A 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0551A -A 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0565A -A 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-0570A -A 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0578 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0584 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-0583A 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-05838 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-0683C 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0583D 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-0694 10.51405 4.54E-05 1.000045 L.32E-O4 WBN-I-RFV -070-0703 10.51405 4.54E-05 1.000045 L.32E-O4 WBN-I-RFV -070-0729A 10.51405 4.54E-05 1.000045 1.32E-04 WBN-1-RFV -070-07298 10.51405 4.54E-05 1.000045 L.32E-04 WBN-I-RFV -070-0729C 10.51405 4.54E-05 1.000045 1.32E-04 WBN-I-RFV -070-074L 10.51405 4.54E-05 1.000045 L32E-04 WBN-I-RFV -070-0835 10.51405 4.54E-05 1.000045 L.32E-04 WBN-1-PMP -070-0046 -A 8.72067 2.76E-03 L.O02767 1.07E-04 WBN-I-CKV -070-0504A -A 8.7L946 2.25E-05 1.000023 1.07E-04 wBN-l-tSV -070-0503A -A 8.56851 3.92E-O7 L

L.O7E-O4 wBN-l-rSV -070-0505A -A 8.55861 3.92E-O7 1

1.07E-04 w B N B KR -235-00 oLl 204-D 8.48321 2.78E-05 1.000029 1.04E-04 wB N -o-FU -235-00 0L/aOL-D 8.48321 2.08E-05 1.000021 1.04E-04 WBN-I-RFV -058-0553 7.7854L 5.30E-03 1.005325 9.45E-05 WBN-I-RFV -058-0s64 7.7854L 5.30E-03 1.005325 9.45E-05 WBN-I-RFV -058-0555 7.7854L 5.30E-03 1.005325 9.45E-05 WBN-I-CKV -053-0585 -S 7.67775 8.79E-05 1.000099 9.29E-05 WBN-I-CKV -063-0587 -S 7.67775 8.79E-05 1.000099 9.29E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 167

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 67 -- Unit 1 Item WBN-I-CKV -053-0588 -S RAW 7.67775 8.78E-05

HRITT, 1.000089 BB 9.29E-05 WBN-I-CKV -053-0589 -S 7.67775 8.78E-05 1.000099 9.29E-05 WBN-I-THV -063-0582 -S 7.67775 L.24E-O7 L

9.29E-05 WBN-I-THV -063-0583 -S 7.67775 L.24E-07 L

9.29E-05 WBN-I-THV -063-0584 -S 7.57775 L.24E-O7 L

9.29E-05 WBN-I-THV -063-0585 -S 7.67775 L.24E-07 L

9.29E-05 wBN B KR -2r2-A00 U10B-A 7.09434 2.25E-05 1.000023 8.49E-05 wB N B KR -2L4-A001/1A1-A 7.09434 2.26E-05 1.000023 8.48E-05 WBN-I-MCC -2L4-A001 -A 7.09434 6.06E-05 1.000051 8.48E-05 WBN-1-CKV -052-0550 -S 5.41593 2.28E-O7 T

7.53E-05 WBN-I-CKV -052-0561 -S 6.41593 2.29E-O7 1

7.53E-05 WBN-I-CKV -062-0562 -S 5.41593 2.28E-A7 L

7.53E-05 WBN-I-CKV -052-0553 -S 5.41593 2.29E-07 1

7.53E-05 WBN-I-CKV -062-0575 -S 5.41593 2.28E-O7 L

7.53E-05 WBN-I-CKV -052-0577 -S 5.41593 2.28E-O7 1

7.53E-05 WBN-I-CKV -052-0578 -S 5.41593 2.28E-07 L

7.53E-05 WBN-I-CKV -052-0579 -S 5.41593 2.28E-O7 1

7.53E-05 WBN-I-CKV -062-0592 -S 6.41593 2.28E-07 L

7.53E-05 WBN-I-CK/ -062-0593 -S 6.41593 2.28E-O7 T

7.53E-05 WBN-I-CKV -062-0594 -S 6.41593 2.28E-O7 1

7.53E-05 WBN-I-CKV -062-0595 -S 6.41593 2.29E-O7 1

7.53E-05 WBN-1-FCV -052-0009 6.41593 2.23E-05 1.000022 7.53E-05 WBN-I-FCV -062-0022 5.41593 2.23E-05 1.000022 7.53E-05 WBN-I-FCV -062-0035 6.41593 2.23E-05 1.000022 7.53E-05 WBN-I-FCV -052-0048 6.41593 2.23E-05 1.000022 7.53E-05 WBN-I-FCV -052-0053 6.41593 3.42E-03 1.003431 7.54E-05 WBN-I-FCV -052-0093 6.41593 2.23E-05 1.000022 7.53E-05 wBN-1-FLTR-o52-0097 5.41593 1.19E-05 1.000012 7.53E-05 wBN-l-rNJ -052-05s6 -S 5.41593 3.55E-O7 1

7.53E-05 wBN-l-tNJ -052-0557 -S 6.41593 3.55E-07 L

7.53E-05 wBN-l-rNJ -062-0558 -S 6.41593 3.55E-07 1

7.53E-05 wBN-l-rNJ -052-0559 -S 5.41593 3.55E-07 1

7.53E-05 wBN-l-rSV -052-0535 -S 6.41593 3.55E-07 L

7.53E-05 wBN-l-rSV -062-0535 -S 6.41593 3.55E-07 L

7.53E-05 wBN-l-tSV -052-0548 -S 6.41593 3.55E-07 L

7.53E-05 wBN-l-tSV -062-0550 -S 5.41593 3.55E-O7 1

7.53E-05 wBN-1-tSV -062-0564 -S 6.41593 3.55E-07 T

7.53E-05 wBN-l-tSV -052-0555 -S 5.41593 3.55E-07 1

7.53E-05 wBN-l-tSV -052-0565 -S 5.41593 3.55E-07 L

7.53E-05 wBN-l-rSV -052-0557 -S 5.41593 3.55E-07 L

7.53E-05 WBN-I-RFV -052-0535 -S 6.41593 1.40E-02 L.OL420L 7.55E-05

Calculation No. MDN-000-999-2008-0 151 l Rev: 001 Plant: WBN Unit 0 Page: 168

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 67 -- Unit I ltem WBN-1-CKV -052-0525 -A RAW 6.34303 FV 2.55E-06 RRW 1.000003 BB 7.43E-05 WBN-I-FAN -030-0183 6.34303 r.70E-o2 L.OL73],L 7.45E-05 WBN-I-PMP -062-0108 -A 6.34303 8.72E-04 1.000973 7.43E-05 WBN-I-CLR -030-0183 5.33159 1.09E-04 1.000109 7.42E-05 WBN-I-CLR -052-0108A -A 6.33159 1.09E-04 1.000109 7.42E-05 WBN-I-CLR -062-OL08B -A 5.33158 1.09E-04 1.000109 7.42E-05 WBN-I-FCV -057-0158 -A 5.33159 2.19E-05 1.000022 7.42E-05 wBN-l-rSV -052-0s09 -A 6.33159 3.45E-07 L

7.42E-05 wBN-l-tSV -052-0527 -A 6.33159 3.45E-07 L

7.42E-05 wBN-l-tSV -067-0500A -A 5.33159 3.45E-07 L

7.42E-O5 WBN-I-ISV -067 -0602A -A 6.33159 3.45E-07 L

7.42E-05 wBN-l-rSV -070-0557A -A 5.33159 3.45E-O7 L

7.42E-05 wBN-l-tSV -070-0800 6.33159 3.45E-07 L

7.42E-05 wBN-l-lSV -070-0801 6.33159 3.45E-07 1

7.42E-05 WBN-I-THV -067 -0501A -A 6.33159 3.45E-07 L

7.42E-05 WBN-I-THV -070-0554A 5.33159 3.45E-O7 1

7.42E-05 WBN-I-PM P -003-0001A -S 5.55050 4.L4E-O2 1.043 Lg7 5.40E-05 WBN-o-BD -236-0004 -G 5.24069 3.53E-05 1.000004 5.90E-05 wB N B KR -235-00 04 I 226-c 5.18849 1.20E-05 1.000012 5.83E-05 wBN-o-cH G R-235-0004 -G 5.18849 5.11E-04 1.000512 5.83E-05 wB N -o-FU -236-00 O4lZLO-G 5.18849 8.39E-05 1.000009 5.83E-05 wBN-o-sw -235-0004/sw1-s 5.18949 1.20E-05 1.000012 5.83E-05 WBN-o-BD -235-0003 -F 4.88011 4.01E-05 1.000004 5.40E-05 w B N B KR -23 5-00 O2l LOg -E 4.58827 2.L6E-O4 1.000215 4.99E-05 wBN -o-FU -235-00 A2/ LOL-E 4.58827 1.53E-04 1.000153 4.99E-05 WBN-o-BAT -235-0002 -E 4.4420L 2.57E-05 1.000025 4.79E-05 WBN-I-FCV -070-0075 -B 4.05910 2.29E-O7 1

4.26E-05 w B N B KR -23 5-00 03 / 226-F 3.97933 9.13E-05 1.000009 4.14E-05 wBN -o-cHG R-235-0003 -F 3.97933 3.65E-04 1.000355 4.14E-05 wBN -o-FU -236-00 03 l2L0-F 3.97933 5.44E-05 1.000006 4.14E-05 wBN-o-sw -235-0003/sw1-s 3.97933 9.13E-05 1.000009 4.14E-05 WBN-I-FAN -030-0491 3.73424 7.L2E-O4 1.000713 3.80E-05 WBN-I-HTX -082-0720A1 -A 3.73424 4.84E-05 1.000049 3.80E-05 WBN-I-HTX -082-0720A2 -A 3.73424 4.84E-05 1.000049 3.80E-05 w B N TAN K-0 18-O06Ll r 3.73424 wB N TAN K-0 18-OO7 6 / L 3.73424 WBN-I-THV -057-0510A 3.73424 1.80E-09 1

3.80E-05 WBN-I-THV -067-0515A 3.73424 1.80E-09 1

3.80E-05 WBN-I-THV -067-8020 -A 3.73424 1.80E-09 T

3.80E-05 WBN-1-PCV -068-0334 -B 3.6L778 3.45E-03 1.003465 3.65E-05 WBN-I-PCV -058-0340A -A 3.59894 3.44E-03 1.00345 3.62E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 169

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ilance roiGOr,WI?l t.

Item WBN-I-FCV -070-0003 -B RAW 3.40493 FV 1.31E-07 RRW L

BB 3.35E-05 wB N-o-B KR -235-000U109-D 3.22693 2.65E-05 1.000026 3.10E-05 wBN F U -235-000U101-D 3.22693 1.97E-05 1.00002 3.10E-05 WBN-o-BAT -236-0001 -D 3.20819 1.66E-05 1.000017 3.07E-05 wBN B KR -2L2-BO0 1/8 B -B 2.87739 5.88E-06 1.000006 2.61E-05 WBN-I-BKR -213-B00U1A1-B 2.87739 5.88E-05 1.000005 2.51E-05 WBN-1-MCC -213-8001 -B 2.87739 1.79E-05 1.000019 2.51E-05 WBN-I-CKV -053-0550 -S 2.84369 2.54E-05 1.000025 2.55E-05 WBN-I-CKV -053-0551 -S 2.84369 2.55E-05 1.000025 2.55E-05 WBN-I-CKV -053-0552 -S 2.84359 2.55E-05 1.000025 2.56E-05 WBN-I-CKV -057-0508A -A 2.8L44L WBN-I-FCV -067-0055 -A 2.8L44L 1.84E-05 1.000002 2.52E-05 wBN-l-tSV -067-0507A -A 2.8L44I 1.80E-09 1

2.52E-05 WBN-I-FCV -053-0003 -A 2.72355 3.73E-06 1.000004 2.40E-05 WBN-I-CKV -063-0510 -S 2.7L299 2.25E-05 1.000023 2.38E-05 WBN-I-CKV -053-0551 -S 2.7L299 2.25E-05 1.000023 2.38E-05 WBN-I-CKV -053-0553 -S 2.7Lzgg 2.25E-05 1.000023 2.39E-05 WBN-I-CKV -053-0555 -S 2.7Lzgg 2.25E-05 1.000023 2.39E-05 WBN-I-CKV -053-0557 -S 2.7Lzgg 2.25E-05 1.000023 2.38E-05 WBN-I-FCV -053-000s -B 2.7L299 1.19E-06 1.000001 2.38E-05 WBN-I-FCV -053-0022 -B 2.7Lzgg 1.19E-05 1.000001 2.39E-05 WBN-I-THV -053-0550 -S 2.7Lzgg WBN-I-THV -053-0552 -S 2.7Lzgg WBN-I-THV -063-0554 -S 2.7Lzgg WBN-I-THV -063-0556 -S 2.7Lzgg wBN-o-rsv -032-0450 -A 2.64569 wBN-o-tsv -o32-L476 -A 2.64569 WBN-1-CKV -003-0805 -A 2.64569 1.16E-05 1.000012 2.29E-05 wBN-1-rSV -003-0803 -A 2.64569 WBN-I-PCV -003-0122 2.64569 1.19E-04 1.000119 2.29E-05 WBN-I-PMP -003-0118 -A 2.64569 1.98E-03 1.001979 2.29E-O5 w B N B KR -235-00 021 2O4-E 2.6377L 3.82E-06 1.000004 2.29E-05 w B N F U -235-00 02 / 20L-E 2.6377L 2.70E-O6 1.000003 2.29E-05 wBN-l-tSV -057-05038 -B 2.63590 wBN-l-rSV -057-05138 -B 2.63590 wBN-l-tSV -070-0725 B -B 2.53590 WBN-1-FAN -030-0493 2.60811 4.05E-04 1.000405 2.24E-O5 WBN-I-HTX -082-07208 1 -B 2.60811 2.40E-05 1.000024 2.24E-05 WBN-I-HTX -082-072082 -B 2.50811 2.40E-05 1.000024 2.24E-05 wBN TAN K-0 18- 0O6Ll 2 2.60811 w B N TAN K-0 18-OA7 6 I 2 2.60811

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 170

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 67 -- Unit { Gomponent lmportance for GDF, RAW > 2 Item WBN-I-THV -057-05108 RAW 2.50811 FV

  • i_*

i:

WBN-I-THV -067-05158 2.60811 WBN-I-THV -067-8021 -B 2.50811 WBN-O-PMP-026-TDFP 2.49829 3.83E-03 1.003844 2.09E-05 wBN-o-rsv -032-0450 -B 2.4955L wBN-o-tsv -o32-L478 -B 2.4955L WBN-1-CKV -003-0805 -B 2.4955r 1.14E-05 1.000011 2.08E-05 wBN-l-rSV -003-0804 -B 2.49551 WBN-1-PCV -003-0132 2.49551 1.11E-04 1.000111 2.08E-05 WBN-I-PMP -003-0128 -B 2.49551 1.80E-03 1.001805 2.08E-05 w B N B KR -23 6-00 O4l 304-G 2.469L2 4.83E-05 1.000005 2.04E-05 w B N F U -235-00 04 / 30L-G 2.469L2 3.53E-06 1.000004 2.04E-05 WBN-I-BD -235-0003 -F 2.36195 3.47E-O4 1.000347 1.90E-05 WBN-1-XSW -235-0003 -F 2.36L96 1.34E-04 1.000134 1.89E-05 WBN-I-SW -235-0003 -F 2.27382 3.31E-05 1.000003 L.778-O5 WBN-I-CKV -003-0810 -S 2.24702 1.07E-05 1.000011 L.73E-05 WBN-I-CKV -003-0854 -S 2.24702 L.O7 E-05 1.000011 L.73E-05 WBN-I-FCV -001-00L7 -A 2.24702 0.00E+00 L

L.73E-05 WBN-I-FCV -001-0018 -B 2.24702 0.00E+00 L

L.73E-05 wBN-1-tSV -003-0809 -S 2.24702 WBN-I-FAN -030-0214 2.06351 5.50E-03 1.005545 1.49E-05 WBN-I-BKD -031-3035 2.05939 wBN-l-rSD -031-3783 2.05839 WBN-I-BKR -010-0039 2.01682 2.62E-05 1.000003 1.41E-05 WBN-1-FU -278-111AJ13 2.OL642 1.84E-05 1.000002 1.41E-05 WBN-1-FU -?78.111AJ14 2.OL642 1.84E-05 1.000002 1.41E-05 WBN-I-PS -003-01384 -A 2.OL642 L.26E-O4 1.000125 1.41E-05 WBN-I.RLY -OOIO-TDPA 2.OL642 2.06E-05 1.000021 1.41E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 171

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM RAI,II FV RRW tsB WBN-2-GEN -082-0002A -A 24.25757 5.25E-02 1.05542 3.33E-04 WBN-2-PM P -003-0001A -S 5.675406 4.348-02 1.045351 6.74E-O5 WBN-2-GEN -082-00028 -B 13.99131 4.07E-Oz L.O424L5 1.86E-04 WBN-2-FAN -030-0450 24.25757 2.46E-42 1.020999 3.33E-04 WBN-2-FAN -030-0183 5.305892 L.72E-42 L.OL7459 7.51E-05 WBN-2-FAN -030-0462 13.99131 1.50E-02 L.OL6279 1.85E-04 WBN-o-PMP -067-0028 -A 2.LO257L L.44E-02 1.014565 1.60E-05 WBN-o-PMP -067-0035 -A 2.LO2148 L.43E-02 L.AL454L 1.59E-05 WBN-2-RFV -052-0535 -S 6.29L574 L.37E-Oz 1.013865 7.58E-05 WBN-2-BKR -2L1-1816 lL6 -A 24.23795 7.33E-03 1.007382 3.32E-04 WBN-2-FAN -030-02L4 2.03529 5.39E-03 L.OO642L 1.49E-05 WBN-2-HTX -070-0185 10.87954 5.19E-03 L.006227 1.41E-04 WBN-2-BKR -2L1-1828 lL6 -B 13.99763 5.80E-03 1.005933 1.86E-04 WBN-2-FAN -030-0448 L.720338 5.53E-03 1.005562 1.04E-05 WBN-2-FAN -030-0452 L.720339 5.53E-03 1.005552 1.04E-05 WBN-2-RFV -068-0553 7.48964 5.05E-03 1.00508 9.28E-05 WBN-2-RFV -058-0564 7.48964 5.05E-03 1.00508 9.28E-05 WBN-2-RFV -058-0555 7.48964 5.05E-03 1.00509 9.29E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 172

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM RAW FV RRW BB WBN-2-STN -063-0200 zItg.g23 2.19E-03 1.002195 3.13E-03 WBN-2-BD -211-A -A 181.2278 1.34E-03 1.00134 2.57E-O3 wBN-o-rsv -070-0503 L25460L 2.LIE-07 1

1.55E-04 wBN-o-tsv -070-0505 L25460L 2.LLE-O7 L

1.55E-04 WBN-o-FCV -067-0L44 -B L2.53275 4.33E-05 1.000004 1.65E-04 WBN-o-FCV -070-0012 -B L2.53275 2.LLE-O7 L

1.55E-04 WBN-o-FCV -070-0022 -B L2.53275 2.LLE-O7 L

1.65E-04 WBN-o-HTX -070-0185 L2.53275 1.86E-04 1.000196 1.65E-04 wBN-o-rsv -067-L009 -B L2.53275 2.LLE-O7 L

1.55E-04 wBN-o-rsv -067-L010 -B L2.53275 2.LLE-A7 1

1.65E-04 wBN-o-rsv -070-0510 -B L2.53275 2.LLE-O7 L

1.55E-04 WBN-2-BD -2L2.BOO2 -B 11.80313 1.07E-04 1.000107 1.54E-04 wB N-2-B KR -2L2-BOO2l LB -B 11.80313 3.93E-05 1.000039 1.54E-04 WBN-2-BKR -2L2-82.8 11.80313 3.93E-05 1.000039 1.54E-04 WBN-2-OXF -2L2-8002 -B 11.80313 2.30E-04 1.00023 1.54E-04 WBN-2-FCV -067-0143 -A 10.87854 2.65E-04 1.000255 1.41E-04 WBN-2-FCV -070-0015 -A 10.87854 L.25E-05 1.000013 1.41E-04 WBN-2-FCV -070-0015 -A 10.87954 L.25E-05 1.000013 L.4LE-O4 WBN-2-HTX -070-0185 10.87954 6.19E-03 L.006227 1.41E-04 wBN-2-rSV -070-0510 -A 10.87854 L.25E-05 1.000013 L.4LE-04 wBN-2-tSV -070-0544A -S 10.87854 1.25E-05 1.000013 1.41E-04 wB N-2-!SV -070-0544C -A 10.87854 1.25E-05 1.000013 1.41E-04 wB N-o-B KR -23 6-0 OO4 l 226-G L0.5745L 3.45E-05 1.000034 L.37E-04 wBN-o-cH G R-235-0004 -G 10.57451 1.17E-03 L.OOLL72 L.37E-O4 wB N F U -23 5-0 OO4 I 210-G 10.57451 2.55E-05 1.000025 L.37E-O4 wBN-o-sw -235-0004/sw1-s 10.57451 3.45E-05 1.000034 L.37E-04 WBN-2-BD -235-0003 -F 10.56107 9.52E-05 1.000095 L.37 E-04 WBN-2-SW -235-0003 -F 10.55107 3.47E-05 1.000035 L.37E-04 WBN-2-XSW -235-0003 -F 10.56107 3.47E-05 1.000035 1.37E-04 wBN-2-tSV -067-0546 -A 10.10128 4.47E-07 L

1.30E-04 wBN-2-tSV -067-L009 10.10129 4.47E-O7 L

1.30E-04 wBN-2-tSV -067-L010 10.10128 4.47E-O7 1

1.30E-04 WBN-2-RFV -070-052L 10.10128 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-055 1A -A 10.10129 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-0555A -A 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-0551A -A 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-0565A -A 10.10129 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0570A -A 10.10129 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-0578 10.10128 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0584 10.10129 4.36E-05 1.000044 1.30E-04

Calculation No. M DN-000-999-2008'0 151 Rev: 001 Plant: WBN Unit 0 Page: 173

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 69 - Unlt 2,spmponent lmpoilance for CDF, RAIV > 2 ITEM WBN-2-RFV -070-0668 RA\\,V 10.10128 FV 4.35E-05 RRW 1.000044 BB 1.30E-04 WBN-2-RFV -070-0683A 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-05838 10.10128 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0683C 10.10128 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0683D 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-0694 10.10128 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0703 10.10129 4.36E-05 1.000044 1.30E-04 WBN-2-RFV -070-0729A 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-07298 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-RFV -070-074L 10.10128 4.35E-05 1.000044 1.30E-04 WBN-2-BD -2L2-BOO1 -B 9.543413 7.97E-O5 1.00009 L.22E-O4 WBN-2.BKR -ZL}-BOOUIB -B 9.543413 2.81E-05 1.000029 L.22E-04 WBN-2-BKR -2L2-81 -B 9.543413 2.81E-05 1.000028 L.22E-04 WBN-2-OXF -2L2-8001 -B 9.543413 1.84E-04 1.000194 L.22E-04 wBN-o-rsv -067-0546 -B 9.038281 2.LLE-;O7 L

1.15E-04 WBN-2-RFV -070-05518 -B 9.038281 2.80E-05 1.000028 1.15E-04 WBN-2-RFV -070-05568 -B 9.038281 2.80E-05 1.000029 1.15E-04 WBN-2-RFV -070-05518 -B 9.038281 2.80E-05 1.000029 1.15E-04 WBN-2-RFV -070-05558 -B 9.038281 2.80E-05 1.000029 1.15E-04 WBN-2-RFV -070-05708 -B 9.038281 2.80E-05 1.000028 1.15E-04 WBN-2-PMP -070-0059 -A 7.95728 2.A2E-03 L.002022 9.94E-05 WBN-2-CKV -070-0504A -A 7.956392 1.55E-05 1.000015 9.94E-05 wBN-2-tSV -070-05034 -A 7.924953 3.18E-07 1

9.99E-05 wBN-2-rSV -070-0505A -A 7.924953 3.18E-07 L

9.89E-05 WBN-0-BKR -236-0003/30 4-F 7.9016 2.53E-05 1.000025 9.85E-05 wB N-o-F U -236-0003/30 1-F 7.90L6 1.88E-05 1.000019 9.86E-05 WBN-2-RFV -058-0553 7.48964 5.05E-03 1.00509 9.28E-05 WBN-2-RFV -068-0554 7.48964 5.05E-03 1.00509 9.28E-05 WBN-2-RFV -068-0555 7.48964 5.05E-03 1.00509 9.28E-05 WBN-2-CKV -063-0585 -S 7.46LL46 8.49E-05 1.000085 9.23E-05 WBN-2-CKV -063-0587 -S 7.46LL46 8.49E-05 1.000095 9.23E-05 WBN-2-CKV -063-0588 -S 7.46LL46 8.49E-05 1.000095 9.23E-05 WBN-2-CKV -053-0589 -S 7.46LL46 8.49E-05 1.000085 9.23E-05 WBN-2-THV -053-0582 -S 7.46LL46 r.20E-07 L

9.23E-05 WBN-2-THV -053-0583 -S 7.46rL46 L.20E-O7 L

9.23E-05 WBN-2-THV -053-0584 -S 7.46LL46 L.20E-O7 1

9.23E-05 WBN-2-THV -053-0585 -S 7.46LL46 L.20E-O7 1

9.23E-05 wB N B KR -zL}-BOOLI rcB-B 7.LL2299 2.19E-05 1.000022 8.73E-05 wB N B KR -ZL4-BOOLI LA1-B 7.LL2299 2.18E-05 L.OOOO22 8.73E-05 WBN-2-MCC -214-8001 -B 7.LLz2gg 6.19E-05 1.000052 8.73E-05 WBN-2-FCV -067-0024 -B 5.49538 2.LLE-O7 1

7.85E-05

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page: 174

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM WBN-2-FCV -A67-0082 -B RAW 5.49539 FV 2,LLE-A7 RRW L

BB 7.85E-05 WBN-2-FCV -057-0128 -B 6.49539 2.LIE-07 L

7.85E-05 wBN-2-tSV -067 -05058 -B 5.49538 2.LLE-O7 1

7.85E-05 wBN-2-rSV -067 -Os05B -B 5.49539 6.11E-09 1

7.85E-05 WBN-2-PMP -062-0108 -A 5.308221 2.78E-03 L.OA27g6 7.59E-05 WBN-2-CKV -052-052s -A 5.305892 2.80E-05 1.000003 7.58E-05 WBN-2-FAN -030-0183 6.306892 L.72E-O2 1.017459 7.61E-05 WBN-2-CLR -030-0183 6.293996 1.05E-04 1.000105 7.55E-05 WBN-2-CLR -062-0108A -A 5.293996 1.05E-04 1.000105 7.56E-05 WBN-2-CLR -062-01088 -A 5.293995 1.05E-04 1.000105 7.56E-05 WBN-2-FCV -067-0158 -A 6.293895 2.11E-05 1.000021 7.56E-05 wBN-2-rSV -062-0509 -A 5.293895 3.35E-07 L

7.55E-05 wBN-2-rSV -062-0527 -A 5.293996 3.35E-07 L

7.55E-05 wBN-2-tSV -067 -0500A -A 6.293895 3.35E-07 L

7.55E-05 wBN-2-rSV -067 -0502A -A 6.293895 3.35E-07 1

7.56E-05 wBN-2-rSV -070-0557A -A 6.293996 3.35E-07 L

7.55E-05 wBN-2-rSV -070-0800 5.293896 3.35E-07 1

7.56E-05 wBN-2-ISV -070-0801 5.293995 3.35E-07 1

7.56E-05 WBN-2-THV -A67 -O501A -A 6.293996 3.36E-07 L

7.55E-05 WBN-2-THV -070-0554A 5.293996 3.35E-07 1

7.55E-05 WBN-2-CKV -062-0550 -S 6.29L574 2.33E-O7 1

7.56E-05 WBN-2-CKV -052-0561 -S 6.29L574 2.33E-07 L

7.55E-05 WBN-2-CKV -062-0562 -S 6.29L574 2.33E-07 1

7.56E-05 WBN-2-CKV -052-0563 -S 6.29L574 2.33E-07 L

7.55E-05 WBN-2-CKV -062-0575 -S 6.29L574 2.33E-O7 L

7.55E-05 WBN-2-CKV -062-0577 -S 6.291574 2.33E-O7 L

7.55E-05 WBN-2-CKV -052-0578 -S 6.291574 2.33E-O7 L

7.55E-05 WBN-2-CKV -062-0579 -S 6.291574 2.33E-07 L

7.56E-05 WBN-2-CKV -052-0592 -S 6.29L574 2.33E-O7 L

7.55E-05 WBN-2-CKV -062-0593 -S 6.29L574 2.33E-07 L

7.56E-05 WBN-2-CKV -062-0594 -S 6.29L574 2.33E-O7 L

7.56E-05 WBN-2-CKV -052-0595 -S 6.29L574 2.33E-O7 1

7.55E-05 WBN-2-FCV -052-0009 6.291574 2.16E-05 1.000022 7.56E-05 WBN-2-FCV -052-0022 6.29L574 2.15E-05 1.000022 7.56E-05 WBN-2-FCV -052-0035 6.29L574 2.16E-05 1.000022 7.56E-05 WBN-2-FCV -062-0048 6.29L574 2.16E-05 1.000022 7.56E-05 WBN-2-FCV -052-0053 6.29L574 3.27E-O3 1.003279 7.55E-05 WBN-2-FCV -062-0093 6.291574 2.16E-05 1.000022 7.56E-05 wBN-2-FLTR-052-0097 6.291574 1.15E-05 1.000012 7.56E-05 wBN-2-tNJ -052-0555 -S 6.29L574 3.53E-07 L

7.56E-05 wBN-2-tNJ -062-0557 -S 6.29L574 3.53E-07 L

7.56E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 175

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM wBN-2-rNJ -062-0558 -S RAW 6.29L574 FV 3.53E-07 RRW L

BB 7.55E-05 wBN-2-tNJ -062-0559 -S 6.29L574 3.53E-07 L

7.56E-05 wBN-2-rSV -052-0535 -S 6.29L574 3.53E-07 L

7.56E-05 wBN-2-tSV -052-0536 -S 6.29L574 3.53E-07 L

7.55E-05 wBN-2-rSV -062-0548 -S 6.29L574 3.53E-A7 L

7.55E-05 wBN-2-tSV -052-0550 -S 6.29L574 3.53E-O7 L

7.55E-05 wBN-2-rSV -052-0564 -S 6.291574 3.53E-O7 L

7.55E-05 wBN-2-tSV -062-0565 -S 6.29L574 3.53E-07 1

7.56E-05 wBN-2-tSV -062-0s56 -S 6.29L574 3.53E-07 L

7.56E-05 wBN-2-rSV -052-0557 -S 6.291574 3.53E-07 L

7.55E-05 WBN-2-RFV -052-0536 -S 6.291574 L.37E-Oz 1.013955 7.58E-05 WBN-2-BD -235-0004 -G 6.193951 4.74E-O5 1.000047 7.42E-A5 WBN-2-SW -235-0004 -G 5.193861 L.73E-05 1.000017 7.42E-O5 WBN-2-XSW -235-0004 -G 5.193851 L.73E-05 1.000017 7.42E-05 WBN-2-PM P -003-0001A -S 5.575405 4.34E-O2 1.045351 5.74E-05 WBN-0-BAT -235-0002 -E 4.7638LL 2.81E-05 1.000029 5.38E-05 wB N-o-B KR -23 6-0 OO2l LOg-E 4.7639LL 1.40E-05 1.000001 5.38E-05 wB N-o-F U -23 6-0 OO2/ LOL-E 4.7638LL 9.55E-07 1.000001 5.38E-05 WBN-o-BD -236-0001 -D 4.310435 4.39E-06 1.000004 4.73E-05 WBN-o-BD -236-0002 -E 3.923073 5.03E-06 1.000005 4.19E-05 WBN-2-FCV -070-0075 -B 3.702L43 2.02E-O7 L

3.85E-05 WBN-o-BAT -236-0001 -D 3.546595 2.00E-05 1.00002 3.78E-05 wB N-o-B KR -23 6-0 OOL/ rcg-D 3.645695 1.09E-05 1.000001 3.78E-05 WBN-o-F U -236-0 OOLI LO1-D 3.645695 7.64E-07 1.000001 3.79E-05 WBN-2-PCV -068-0334 -B 3.55248 3.54E-03 1.003551 3.65E-05 wB N-2-PCV -058-0340A -A 3.5477 3.53E-03 1.003544 3.64E-05 WBN-2-FAN -030-0492 3.454331 6.4LE-O4 1.000641 3.51E-05 wB N-2-HTX -082-07 20 AL - A 3.454331 4.29E-05 1.000043 3.51E-05 wB N-2-HTX -082-07 20A2 -A 3.454331 4.29E-05 1.000043 3.51E-05 w B N TAN K-0 18- 0O6Ll 3 3.454331 w B N TAN K-0 18-OO7 6 I 3 3.454331 WBN-2-THV -057-0510A 3.454331 1.75E-09 L

3.51E-05 WBN-2-THV -067-0515A 3.454331 1.75E-09 L

3.51E-05 WBN-2-THV -067-8020 -A 3.454331 1.76E-09 L

3.51E-05 WBN-2-FCV -070-0003 -B 3.33988 6.37E-09 1

3.34E-05 WBN-2-CKV -053-0550 -S 2.952835 2.58E-05 1.000027 2.79E-O5 WBN-2-CKV -053-0551 -S 2.952835 2.68E-05 1.000027 2.79E-O5 WBN-2-CKV -053-0562 -S 2.952935 2.58E-05 1.000027 2.79E-05 WBN-2-CKV -053-0553 -S 2.952935 2.58E-05 1.000027 2.79E-05 WBN-2-FCV -070-0004 -A 2.946212 1.29E-05 1.000013 2.78E-05 wBN-2-rSV -070-0501 2.9462L2 1.22E-05 1.000012 2.79E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 176

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM WBN-2-!SV -070-0515 RAW 2.9462L2 FV L.22E-A5 RRW 1.000012 BB 2.78E-05 wB N-o-B KR -23 6-0 004 I 304-G 2.g1g996 4.47E-O6 1.000004 2.74E-05 wB N-o-F U -23 6-0 0O4 I 301-G 2.918995 3.16E-05 1.000003 2.74E-05 WBN-2-FAN -030-0494 2.89044 4.77E-04 L.OOO477 2.70E-05 wB N-2-HTX -082-07 2081 -B 2.89044 2.83E-05 1.000029 2.70E-05 WBN-2-HTX -082-07 2082 -B 2.89044 2.83E-05 1.000029 2.70E-05 wB N TAN K-0 18-OO6LI 4 2.89044 wB N-2-TAN K-0 18- 007 6 / 4 2.89044 WBN-2-THV -067-A5108 2.89044 WBN-2-THV -A67-05158 2.89044 WBN-2-THV -067-8021 -B 2.89044 WBN-2-FCV -063-0003 -A 2.579599 3.57E-06 1.000004 2.40E-05 WBN-2-CKV -063-0510 -S 2.568353 2.19E-05 1.000022 2.38E-05 WBN-2-CKV -053-0551 -S 2.559353 2.18E-05 1.000022 2.38E-05 WBN-2-CKV -063-0553 -S 2.669353 2.18E-05 1.000022 2.38E-05 WBN-2-CKV -063-0555 -S 2.559353 2.18E-05 1.000022 2.38E-05 WBN-2-CKV -053-0557 -S 2.559353 2.18E-05 1.000022 2.39E-05 WBN-2-FCV -053-0005 -B 2.658353 1.09E-05 1.000001 2.38E-05 WBN-2-FCV -053-0022 -B 2.658353 1.09E-05 1.000001 2.38E-05 WBN-2-THV -053-0550 -S 2.669353 WBN-2-THV -053-0552 -S 2.569353 WBN-2-THV -053-0s54 -S 2.659353 WBN-2-THV -053-0556 -S 2.659353 WBN-2-PMP -062-0104 -B 2.642L42 8.50E-04 1.000851 2.35E-05 WBN-2-CKV -067-0508A -A 2.519995 WBN-2-FCV -067-0056 -A 2.619995 1.64E-06 1.000002 2.31E-05 wB N-o-B KR -23 5-0 OO2l 204-E 2.5L4L75 5.11E-05 1.000005 2.15E-05 wB N-o-F U -23 6-0 OO2l 20L-E 2.5L4L75 3.80E-05 1.000004 2.15E-05 WBN-2-PMP -003-0118 -A 2.455259 1.85E-03 1.001856 2.08E-05 WBN-2-PMP -003-0128 -B 2.4L277L 1.90E-03 1.001906 2.02E-05 wBN-o-rsv -032-0460 -A 2.395025 wBN-o-lsv -032-1476 -A 2.395025 WBN-2-CKV -003-0805 -A 2.395025 9.51E-06 1.00001 1.99E-05 wBN-2-rSV -003-0803 -A 2.395025 WBN-2-PCV -003-0L22 2.395025 9.98E-05 1.0001 1.99E-05 wBN-o-rsv -032-0450 -B 2.369612 wBN-o-tsv -032-1478 -B 2.3696L2 WBN-2-CKV -003-0805 -B 2.3696L2 9.35E-05 1.000009 1.95E-05 wBN-2-tSV -003-0804 -B 2.3696L2 WBN-2-PCV -003-0L32 2.3696L2 9.91E-05 1.000099 1.95E-05 WBN-2-BKR -2L2-8001/8B -B 2.289LL7 4.L7 E-05 1.000004 1.84E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 177

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 69 - Unit 2 COmponent lmportance for CDF, RAW > a ITEM wB N-2-B KR -2 13-800u1A1-B RAW 2.289LL7 FV 4.L7E-06 RRW 1.000004 BB 1.84E-05 WBN-2-MCC -213-8001 -B 2.289LL7 L.23E-05 1.000012 1.84E-05 WBN-2-BD -235-0001 -D 2.28L202 1.02E-05 1.00001 1.83E-05 WBN-2-SW -235-0001 -D 2.28L2A2 3.32E-05 1.000003 1.83E-05 WBN-2-XSW -235-0001 -D 2.29L202 3.32E-05 1.000003 1.93E-05 WBN-2-CKV -070-067L 2.158959 5.34E-09 L

1.57E-05 WBN-2-CKV -070-0679 2.159969 5.34E-08 L

1.57E-05 WBN-2-CKV -070-0581A 2.169969 5.34E-08 1

1.57E-05 WBN-2-CKV -070-05818 2.158969 5.34E-08 T

1.57E-05 WBN-2-CKV -070-0581C 2.158969 5.34E-08 L

1.67E-05 WBN-2-CKV -070-0581D 2.158869 5.34E-08 L

1.67E-05 WBN-2-CKV -070-0682A 2.168859 5.34E-08 1

1.57E-05 WBN-2-CKV -070-05828 2.169969 5.34E-08 L

L.67 E-05 WBN-2-CKV -070-0682C 2.168969 5.34E-08 1

L.67 E-05 WBN-2-CKV -070-0582D 2.159959 5.34E-08 L

1.57E-05 WBN-2-FCV -070-0087 -B

2. t5gg6g 7.48E-07 1.000001 1.57E-05 WBN-2-FCV -070-0090 -A 2.158859 7.48E-O7 1.000001 1.57E-05 WBN-2-FCV -070-0133 -A 2.168859 7.48E-O7 1.000001 1.67E-05 WBN-2-FCV -070-0134 -B 2.168959 7.48E-O7 1.000001 1.57E-05 WBN-2-HTX -068-0008 2.169969 6.52E-06 1.000006 1.67E-05 WBN-2-HTX -068-0031 2.158959 5.52E-05 1.000005 1.57E-05 WBN-2-HTX -058-0050 2.159969 5.52E-05 1.000005 1.67E-05 WBN-2-HTX -058-0073 2.168969 6.52E-05 1.000005 1.57E-05 wBN-2-rSV -070-0680 2.159959 8.09E-08 L

1.67E-05 wBN-2-rSV -070-0590 2.169969 8.09E-08 L

1.57E-05 wBN-2-rSV -070-0736 2.159959 8.09E-08 L

1.57E-05 WBN-2-THV -070-0584A 2.158969 8.09E-08 L

1.57E-05 WBN-2-THV -070-05848 2.169969 8.09E-08 L

1.57E-05 WBN-2-THV -070-0584C 2.158969 8.09E-08 L

1.57E-05 WBN-2-THV -070-0684D 2.158959 8.09E-08 L

1.67E-05 WBN-2-CKV -003-0810 -S 2.L69373 9.80E-05 1.00001 1.57E-05 WBN-2-CKV -003-0854 -S 2.L69373 9.80E-05 1.00001 1.67E-05 WBN-2-FCV -001-0017 -A 2.L68373 0.00E+00 L

t.67 E-05 WBN-2-FCV -001-0018 -B 2.L69373 0.00E+00 1

L.67 E-05 wBN-2-rSV -003-0809 -S 2.L68373 WBN-0-PMP -067-0028 -A 2.LO257L L.44E-02 1.014555 1.60E-05 WBN-0-PMP -067-0036 -A 2.LOZL4$

1.43E-02 1.014541 1.59E-05 wBN-2-rSV -057-06038 -B 2.098334 wBN-2-tSV -067-0613B -B 2.098334 WBN-2-!SV -070-07 258 -B 2.098334 WBN-2-FAN -030-02L4 2.03529 6.38E-03 1.006421 1.49E-05

Calculation No. MDN-000'999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 178

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table G9 -- Unit 2 Gomponent lmportance for GDF, RAW > 2 ITEM WBN-2-BKD -031-3035 RAW 2,030269 FV

  • y BB wBN-2-rSD -031-3783 2.030269 WBN-2-STN -063-0200 z1-g.g23 2.19E-03 1.002195 3.13E-03 WBN.2-BD.211-A -A 181.2278 1.34E-03 1.00134 2.57E-03 wBN-o-cKV -057-0s03H -B 104.6859 3.86E-04 1.000395 1.48E-03 wBN-o-cKV -057-0503F -B 104.6846 3.85E-04 1.000385 1.48E-03 wBN-o-cKV -057-0503D -A 100.3502 4.27 E-04 L.OAO427 L.42E-03 wBN-o-cKV -057-0503 B -A 100.3501 4.27E-O4 L.OOO427 L.42E-03 WBN-2-BD -2L2-AOO2 -A 89.522L6 9.19E-04 1.00092 1.26E-03 WBN-2-BKR -2L2-A002/18 -A 89.522L6 3.50E-04 1.00035 1.25E-03 WBN-2-BKR -2L2-A2 -A 89.522L6 3.60E-04 1.00036 1.26E-03 WBN-2-OXF -2L2-A002 -A 89.522L6 1.92E-03 1.001923 1.25E-03 wBN-2-rSV -067-0505A -A 87.59333 2.74E-O6 1.000003 1.24E-03 ESFAS CABINETS U2 57.2I7L2 9.22E-O4 1.000923 8.03E-04 WBN-o-BD -235-0003 -F 42.684L5 6.88E-05 1.000069 5.95E-04 wB N -o-BKR -23 6-0 003 I 225-F 35.20562 1.35E-04 1.000135 4.99E-04 wBN-o-cHG R-235-0003 -F 35.20562 4.L7E-O3 1.004192 4.89E-04 WBN-o-F U -235-0 003 1210-F 35.20552 1.02E-04 1.000102 4.89E-04 wBN-o-sw -235-0003/sw 1-s 35.20562 1.35E-04 1.000135 4.89E-04 WBN-2-BD -211-8 -B 35.09599 2.88E-04 1.000299 4.87E-O4 WBN-o-BD -236-0004 -G 31.55598 4.59E-05 1.000047 4.38E-04 WBN-2-FAN -030-0450 24.25757 2.06E-02 1.020999 3.33E-04 WBN-2-G EN -082-0002A -A 24.25757 5.25E-02 1.05542 3.33E-04 WBN.2-BKR -2LL-L8L6I L6 -A 24.23795 7.33E-03 L.OO7382 3.32E-04 WBN-2-FCO -030-0444 -A 24.2L37 2.88E-03 1.00299 3.32E-04 WBN-2-FCO -030-0460 -A 24.2L37 2.88E-03 1.00299 3.32E-04 WBN-2-TANK-063-0046 23.51581 1.09E-05 1.000001 3.22E-04 WBN-2-BD -2L2-AOO1 -A 22.25579 2.L7E-04 1.000219 3.04E-04 WBN-2-B KR -2L2-A001/1B -A 22.25579 8.38E-05 1.000094 3.04E-04 WBN.2.BKR -2L2-A1 -A 22.25579 8.38E-05 1.000084 3.04E-04 WBN-2-OXF -2L2-A001 -A 22.25578 4.60E-04 1.00045 3.04E-04 W B N B KR -2L2-AOOL/ LOB-A 20.9L979 7.86E-05 1.000079 2.85E-04 wB N-2-B KR -2L4-AOOLI LA1-A 20.9L979 7.85E-05 1.000079 2.85E-04 WBN-2-MCC -2L4-A001 -A 20.9L979 2.O4E-04 1,000204 2.85E-04 WBN-2-BKR -099-1115/18 -A 19.56699 6.91E-04 1.000591 2.67E-O4 WBN-2-BKR -099-LLL6( LC -B 18.83844 5.50E-04 1.000651 2.55E-04 WBN-2-BKR -2L1-1828 116 -B L3.99763 5.80E-03 1.005933 1.85E-04 WBN-2-FAN -030-0462 13.99131 1.60E-02 L.OL6279 1.86E-04 WBN-2-GEN -082-00028 -B 13.99131 4.O7E-02 L.O424L5 1.86E-04 WBN-2-FCO -030-0446 -B L3.96L76 2.25E-03 L.002254 1.85E-04 WBN-2-FCO -030-0462 -B L3.96L76 2.25E-03 L.002254 1.85E-04

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:179

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 70 -- Unit I HRA GDF lmportance F-V >0.570 Euent Probability FU B,B RRW RAW Description HARRl 3.80E-03 L.43E-01 5.22E-04 1.1663 38.3817 Align high pressure recirculation, given auto swapover works AFWOP3 1.10E-02 L.ZLE-OL L.52E-04 T,L37L 11.84 Depressurizelcooldown to low pressure injection following small LOCA with failur HACCSR2 1.50E-02 8.67E-Oa 7.54E-05 1.095 5.3338 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HAPRl 4.50E-03 7.96E-03 2.46E-05 1.008 2.7609 lsolate open PORV with block valve after Sl DHARR3 1.00E-03 7.40E-03 1.03E-04 1.0075 8.3873 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCUIATION HAO82 1.50E-02 5.95E-03 5.17E-06 1.006 1.3555 Establish RCS Bleed and Feed cooling given no CCPS running AFWOPl 2.LOE-OZ 5.42E-03 3.59E-06 1.0054 L.2526 Depressurizelcooldown to low pressure injection following MLOCA HARRl 3.80E-03 L.43E-0L 5,22E-04 1.1663 38.3817 Align high pressure recirculation, given auto swapover works AFWOP3 1.10E-02 1.21E-01 L.52E-04 L.L37L 11.84 Depressurizelcooldown to low pressure injection following small LOCA with failur HACCSR2 1.60E-02 8.67E-02 7.54E-05 1.095 5.3339 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HAERCW3 5.00E-02 8.20E-02 2.28E-05 1.0894 2.5584 OPERATOR FAILS TO ALIGN FIRE PROTECTION TO CCP A HACHl 1.10E-02 6.62E-02 8.37E-05 1.0709 5.9528 Transfer Containment Spray to Sump (RHR Swap Successful)

HAERCW2 7.80E-02 5.81E-02 1.04E-05 L.06L7 1.5855 OPERATOR FAILS TO ALIGN FIRE PROTECTION PUMP TO ERCW HEADER HAMU2B 5.00E-03 5.58E-02 1.58E-04 1.0602 12.3011 Makeup tq RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 5.68E-02 1.58E-04 1.0502 L2.3OLL Makeup to RWST using containment spray test recirc from sump during small LOCA SS!OP 6.70E-03 3.65E-02 7.57E-O5 1.0378 6.4044 Terminate Safety lnjection to prevent PORV water challenge HARLl 2.30E-03 1.89E-02 1.15E-04 1.0193 9.2L4L Recover from auto swapover failure

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 180

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 71 -- lJnit I HRA GDF Importance RAW >2 Event ProbabiliW FV BB RRW RAW Descrlption WHESUM 3.50E-07 8.11E-05 3.22E-03 1.0001 232.7L8.L Remove Drain Plugs from Refueling Canal After Refueling WHESDB 1 2.00E-05 3.95E-04 2.74E-03 1.0004 198.1358 6.9kV Shutdown Board 1-A Automatic Features Disabled HARRl 3.80E-03 1.43E-01 5.22E-04 1.1653 38.3817 Align high pressure recirculation, given auto swapover works WHESDB 2 2.00E-06 5.55E-05 3.87E-04 1.0001 28.8041 6.9kV Shutdown Board 1-B Automatic Features Disabled WHESDB 4 2.00E-05 3.13E-05 2,L7E-04 L

15.6313 6.9kV Shutdown Board 2-B Automatic Features Disabled HAMU2B 5.00E-03 5.58E-02 1.58E-04 1.0502 L2.3OLL Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 5.68E-02 L.58E-04 1.0602 L230tL Makeup to RWST using containment spray test recirc from sump during small LOCA AFWOP3 1.10E-02 1.21E-01 L.52E-04 t.L37L 11.84 Depressurize/cooldown to low pressure injection following small LOCA with failur HARLl 2.30E-03 1.89E-02 1.15E-04 1.0193 9,2L4L Recover from auto swapover failure DHARR3 1.00E-03 7.40E-03 1.03E-04 1.0075 8.3873 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCULATION HACHl 1.10E-02 5.52E-02 8.37E-05 1.0709 6.9528 Transfer Containment Spray to Sump (RHR Swap Successful)

SSIOP 6.70E-03 3.55E-02 7.57E-05 1.0378 6.4044 Terminate Safety lnjection to prevent PORV water challenge HACCSR2 1.50E-02 8.67E-Oz 7.54E-05 1.095 5.3339 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HCRLl 3.80E-03 1.85E-02 6.77E-05 1.0188 5.8466 lnadvertently Reset Sl Signal, Failure of Auto Sump Swapover HAOS3 1.90E-04 8.03E-04 5.88E-05 1.0008 5.2234 Start AFW (Reactor trip, no Sl)

RSIOP 5.90E-04 1.55E-03 3.13E-05 1.0015 3.2501 Operator Restarts Safety lnjection to restore RCS makeup HARTl 1.40E-03 3.07E-03 3.05E-05 1.0031 3.L927 Manually trip reactor, given SSPS fails WHESDB 3 2.00E-06 4.15E-05 2.89E-05 1

3.0757 5.9kV Shutdown Board 2-A Automatic Features Disabled HAPRl 4.50E-03 7.96E-03 2.45E-05 1.008 2.7649 lsolate open PORV with block valve after Sl HAERCW3 5.00E-02 8.20E-02 2.28E-05 1.0894 2.5584 OPERATOR FAILS TO ALIGN FIRE PROTECTION TO CCP A WHEMDA L 1.20E-04 1.54E-04 1.90E-05 1.0002 2.3625 Motor Driven AFW Pump Train A lsolation Test Error WHEMDA 2 1.20E-04 L.52E-O4 1.75E-05 1.0002 2.2659 Motor Driven AFW Pump Train B lsolation Test Error

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 1 81

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 72 -- Unit 2 HRA GDF lmportance F-V >0.5yo Euent Probability R'

BB RRW RAW Descriffion HARRl 3.80E-03 1.39E-01 5.22E-04 1.1511 37.3735 Align high pressure recirculation, given auto swapover works AFWOP3 1.10E-02 1.17E-01 1.52E-04 1.1328 LL.5374 Depressurize/cooldown to low pressure injection following small LOCA with failur HAERCW3 5.00E-02 9.34E-02 2.67E-05 1.103 2.7749 OPERATOR FAILS TO ALIGN FIRE PROTECTION TO CCP A HACCSR2 1.60E-02 8.24E-02 7.36E-05 1.0898 5.0675 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HACHl 1.10E-02 6.26E-02 8.13E-05 1.0669 6.5318 Transfer Containment Spray to Sump (RHR Swap Successful)

HAMUzB 5.00E-03 5.48E-02 L.57E-04 1.058 LL.9L29 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 5.48E-02 L.57E-04 1.058 LL.9L29 Makeup to RWST using containment spray test recirc from sump during small LOCA SSIOP 5.70E-03 3.53E-02 7.54E-05 1.0366 6.24A4 Terminate Safety lnjection to prevent PORV water challenge HMEIE 1.80E-03 2.84E-02 2.26E-04 L.0292 L6.7572 Start standby ERCW pump - operating pump fails - normal ops HAAEl.

2.00E-04 2.77E-02 1.98E-03 1.0285 L39.2979 Start standby ERCW pump - running pump fails (non-Sl)

HAAFl 2.20E-O2 2.38E-02 1.54E-05 L.0243 2.0567 Locally operate TD AFW valves to control flow on SBO HARLl 2.30E-03 L.94E-02 1.20E-04 1.0198 9.4013 Recover from auto swapover failure HCRLl 3.80E-03 L.82E-O2 5.85E-05 1.0185 5.7792 lnadvertently Reset SI Signal, Failure of Auto Sump Swapover HAOSBF 2.00E-01 L.28E-02 9.L4E-O7 1.013 1.0512 Steam generator feed with manual leve! control fails HAPRl 4.50E-03 7.65E-03 2.43E-05 L.0077 2.692L lsolate open PORV with block valve after Sl DHARR3 1.00E-03 7.15E-03 L.02E-04 L.0072 8.1411 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCULATION FLTBlC 1.00E-02 5.78E-03 9.58E-05 1.0058 L.6709 lsolate CCW following major break in Turbine Building HARTl 1.40E-03 6.20E-03 5.33E-05 1.0052 5.4215 Manually trip reactor, given SSPS fails AFWOPl 2.LOE-OZ 5.31E-03 3.62E-06 1.0053 L.2477 Depressurizelcooldown to low pressure injection following MLOCA HAO82 1.50E-02 5.29E-03 4.73E-06 1.0053 1.3255 Establish RCS Bleed and Feed cooling given no CCPS running

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SUMMARY

Table 73 --

lmportance RAW > 2 Etrent Probability FV BB RRW BAW feicription AFWOP3 1.10E-02 L.L7E-OL L.52E-04 1.1328 LL.5374 Depressurize/cooldown to low pressure injection following small LOCA with failur DHARR3 1,.00E-03 7.15E-03 1.02E-04 L.0072 8.1411 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCUIATION FLAB2RS 1.30E-03 1.75E-03 1.92E-05 1.00L7 2.34L lsolate ESF room cooling due to large (1 to 2 thousand gpm flood)

HAAEl 2.00E-04 2.77E-O2 1.98E-03 1.0285 L39.2979 Start standby ERCW pump - running pump fails (non-Sl)

HAAE!E 1.80E-03 2.84E-02 2.26E-O4 L.0292 L6.7572 Start standby ERCW pump - operating pump fails - normal ops HAAFT 2.20E-O2 2.38E-02 1.54E-05 L.0243 2.0567 Locally operate TD AFW valves to control flow on SBO HACCSR2 1.50E-02 8.24E-02 7.35E-05 1.0898 6.0675 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HACHl 1.10E-02 6.26E-02 8.13E-05 1.0568 6.6318 Transfer Containment Spray to Sump (RHR Swap Successful)

HACV2 1.90E-03 2.22E-03 1.57E-05 L.OO22 2.L64L Manually start standby CCP, given running pump fails (plant trip, no SI)

HAERCW3 5.00E-02 9.34E-02 2.67E-05 1.103 2.7749 OPERATOR FAILS TO ALIGN FIRE PROTECTION TO CCP A HAMU2B 5.00E-03 5.48E-02 L.57E-04 1.058 11.9L29 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 5.48E-02 L.57E-O4 1.058 11.9L29 Makeup to RWST using containment spray test recirc from sump during small LOCA HAOS3 1.90E-04 6.10E-04 4.59E-05 1.0005 4.209L Start AFW (Reactor trip, no SI)

HAPRl 4.50E-03 7.65E-03 2.43E-O5 L.OO77 2.692L lsolate open PORV with block valve after Sl HARLl 2.30E-03 1.94E-02 1.20E-04 1.0198 9.4013 Recover from auto swapover failure HARRl 3.80E-03 1.39E-01 5.22E-O4 1.1511 37.3735 Align high pressure recirculation, given auto swapover works HARTl 1.40E-03 5.20E-03 5.33E-05 L.0062 5.42L5 Manually trip reactor, given SSPS fails HCRLl 3.80E-03 L.82E-O2 6.85E-05 1.0185 5.7792 lnadvertently Reset Sl Signal, Failure of Auto Sump Swapover HTPRl 1.70E-03 1.80E-03 1.51E-05 1.0018 2.0577 Start TD AFW pump and control LCVs during LOSP (fails to start initially)

RSIOP 5.90E-04 1.51E-03 3.13E-05 1.0015 3.1911 Operator Restarts Safety lnjection to restore RCS makeup SSIOP 6.70E-03 3.53E-02 7.54E-05 1.0355 6.2404 Terminate Safety lnjection to prevent PORV water challenge WHEMDA 1 L.20E-04 1.39E-04 1.65E-05 1.0001 2.L554 Motor Driven AFW Pump Train A lsolation Test Error WHEMDA 2 L.20E-04 1.38E-04 1.65E-05 1.0001 2.L5L6 Motor Driven AFW Pump Train B lsolation Test Error WHESDB 1 2.00E-06 6.46E-06 4.61E-05 t

4.2284 5.9kV Shutdown Board t-A Automatic Features Disab ed WHESDB 2 2.00E-06 3.28E-05 2.34E-04 1

L7.4084 5.9kV Shutdown Board 1-B Automatic Features D sab ed WHESDB 3 2.00E-05 2.53E-04 1.80E-03 1.0003 L27.2L75 5.9kV Shutdown Board 2-A Automatic Features D sab ed WHESDB 4 2.00E-05 4.99E-05 3.56E-04 1

25.929L 6.9kV Shutdown Board 2-B Automatic Features D sab ed WHESUM 3.50E-07 7.90E-05 3.22E-O3 1.0001 225.6L68 Remove Drain Plugs from Refueling Canal After Refueling

lc t--'--'-"-"-""-'-'ttt"--t I subject WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I Table 74 -- Unit 1 Basic Event GDF lmportance FJtl >0.570 Euent Probability R'

BB RRW RAW Description PAF 9.14E-01 1.00E+00 1.52E-05 1E+30 1.0941 PIANT AVAI LABI LITY FACTOR RCPSEALLSZ 2.08E-01 3.54E-01 2.37E-Os L.5475 2.35L2 RCP SEAL L82 GPM FL-BATDEP 1.00E+00 7.03E-02 9.78E-O7 1.0755 L

Battery Depleted FLAG PTSF11PMP OO3OO1AS 1.05E-02 3.59E-02 4.78E-05 1.0373 4.4035 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1-3-1AS DGGFR1GEN O821A.A L.24E-02 3.57E-O2 4.00E-05 L.037 3.843 DG 1A.A FAILS TO RUN SUMMER 2.00E-01 2.90E-02 2.02E-06 1.0299 1.1159 SUMMER SEASON xsBo14 4.59E-02 2.84E-02 8.60E-05 L.0292 1.5901 Bqggvery Sequence 7 (Common Cause of DG to Start) GR xsBo13 5.60E-02 2.78E-02 5.92E-06 1.0285 L.4694 Recovery Sequence 7 (Common Cause of DG to Start) PC FL-ATWS 1.00E+00 2.70E-02 3.76E-07 L.0277 1

ATWS MORFO1FCV 06700066 9.70E-04 2.33E-02 3.34E-04 1.0239 25.0041 Added for evaluation WBN-2-10-135 and WBN-2-11-0006 DGGFD1GEN 0821A-A 7.15E-03 2.28E-02 4.43E-05 1.0233 4.L629 DG 1A-A FAILS TO START AND RUN FIRST HOUR DGGFR1GEN O821B.B L.24E-O2 2.O9E-O2 2.35E-05 L.O2L4 2,6693 DG 1B-B FAILS TO RUN DGGFR2GEN 08228-8 L.24E-02 1.93E-02 2.L7E-05 L.OL97 2.542 DG 2B-B FATLS FAILS TO RUN (WBN-2-GEN -082-00028 -B) xsBo15 1.37E-01 L.70E-O2 L.73E-05 L.OL73 L.LO7L Recovery Sequence 7 (Common Cause of DG to Start) Wl MORFO2FCV 06700067 9.70E-04 L.62E-02 2.33E-04 1.0155 t7.7057 Added for evaluation WBN-2-10-135 and WBN-2-1L-0005 OBLOCK 7.50E-01 L.54E-02 2.86E-O7 L.OL57 1.0051 Probability that 0 PORVs are blocked FNSFD1FAN 030459 4.80E-03 1.53E-02 4.42E-05 1.0155 4,L6L9 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR FNSFR1FAN O3OOO183 2.55E-03 L.49E-O2 7.78E-05 1.0151 6.5798 CCP A ROOM COOLER FAN FAILS DURING OPERATION xsBo11 5.62E-01 1.43E-02 3.01E-07 1.0145 1.0073 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) GR DGGFD1GEN 08218-8 7.15E-03 1.43E-02 2.78E-05 1.0145 2.98L2 DG 1B-B FAILS TO START AND RUN FIRST HOUR PRAI2 1.70E-01 L.4LE-02 1.15 E-06 1.0143 1.0687 lnterval2 for PRA (pres relief requires 3 SVs & 2 PORVs)

RLVFO1RFV 0520535 2.47E-03 1.40E-02 7.87E-05 L.0L42 6.6443 WBN-1-RFV-062-0635-S RELIEF VALVE FAILS TO OPEN MORFO1FCV 06700057 9.70E-04 L.26E-02 1.80E-04 L.OL27 13.9385 Added for evaluation WBN-2-10-135 and WBN-2-11-0006 xsBo10 7.06E-01 L.23E-02 2.42E-07 1.0125 1.0051 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) PC BUSFROBD 2362E IE 3.80E-03 L.15E-02 4.22E-05 L.OLL7 4.0243 125V DC VITAL BATTERY BOARD II FAILS DURING OPERATION

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SUMMARY

Table 74 -- Unit T EasiC::E*ent CDF lmpoilance F-V >0.596 Euent ProbablliW ru trB RRW RAW Description DGGFD2GEN 08228-8 7.15E-03 t.L2E-02 2.18E-05 1.0113 2.5528 DIESEL GENERATOR FAILS TO START AND RUN FIRST HOUR (WBN-2-GEN -082-00028 -B)

SEQFDlA-A 3.33E-03 1.06E-02 4.41E-05 1.0107 4.1589 SEQUENCER 1A-A FAILS (Unknown UNID)

DGGFRzGEN 0822A-A L.24E-02 1.05E-02 1.18E-05 1.0105 L,837L DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR FNSFD1FAN 030461 4.80E-03 9.55E-03 2.77E-Os 1.0095 2.98 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR xsBo17 6.62E-01 9.25E-03 L.94E-O7 1.0093 L.OO47 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) GR cRt 1.20E-06 8.51E-03 9.39E-02 1.0085 6754.294 CONTROL RODS FAILTO INSERT cB KFO 1 B KR_z LLLT L6 / rc-A 2.55E-03 8.12E-03 4.43E-05 1.0082 4.t765 w B N B KR-2 LL-L7 L6 / L6-A B R EAKE R FAt LS TO O p E N xsBo16 7.06E-01 7.93E-03 1.56E-07 1.008 1.0033 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) PC FNSFR1FAN 030459 2.55E-03 7.50E-03 3.97E-05 L.OO77 3.8434 EXHAUST FAN 1-FAN-30.459 FAILS TO RUN FNSFD2FAN 030462 4.80E-03 7.49E-03 2.L7E-05 1.0075 2.5532 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR XPORVl 5.29E-O2 7.44E-O3 1.95E-06 1.0075 1.1332 BLOCK VALVE CLOSED TO ISOIATE LEAKING PORV SEqFDIB.B 3.33E-03 6.50E-03 2.76E-05 1.0056 2.9764 SEQUENCER 1B-B FAILS (Unknown UNID)

DGGFD2GEN 0822A-A 7.15E-03 6.05E-03 1.18E-05 1.0051 L.8423 DIESEL GENERATOR 2A-A FAILS TO START AND RUN FIRST HOUR PTSFR1PMP OO3OO1AS 1.51E-03 5.46E-03 4.73E-05 1.0055 4.393 PUMP FAILS AFTER 1 HOUR WBN.2-3-1AS SRVSR1SRV 06800563 7.95E-04 5.30E-03 9.27E-05 1.0053 7.657L SAFEW VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN.1 s53 SRVSR1SRV 05800564 7.95E-04 5.30E-03 9.27E-O5 1.0053 7,657L SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN-1 564 SRVSR1SRV 06800555 7.95E-04 5.30E-03 9.27E-05 1.0053 7.557L SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN.1 555 SEQFD2B-B 3.33E-03 5.19E-03 2.L7E-Os 1.0052 2.552L SEQUENCER 2B-B FAILS (Unknown UNID)

CB K FO 1 B KR-z LLLT 28 I T6-9 2.55E-03 5.14E-03 2.80E-05 1.0052 3.0101 WBN-1-BKR-2 LL-L728/u6B BREAKER FATLS TO OPEN PR-INS 1.00E+00 5.05E-03 7.03E-08 1.0051 t

lnsufficient pressure relief Note: this table does not include CCF, HEPs, oI T&M

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SUMMARY

Table 75 -- Unit { Basic Event CBF lmportance RAW > 2 Event Probabilitv FU EB RRW RAW Description cRr 1.20E-05 8.51E-03 9.39E-02 1.0085 6754.294 CONTROL RODS FAIL TO INSERT SMPPS1STN SUMPz 1.00E-05 2.25E-03 3.13E-03 1.0023 225.8325 suMP sugfloN STRATNERS PLUGGED (GENERAL)

BUSFRl.BD 211A-A 1.04E-05 2.10E-03 2.80E-03 1.0021 202.3085 WBN.1.-BD.211-A SHUTDOWN BOARD FAILS BUSFRlBD 2L2A2-A 1.04E-05 8.94E-04 1.19E-03 1.0009 86.7497 WBN.1-BD-212-AOO2-A SWITCH BOARD FA! LS DU R! NG OPERATION CBKXO1BKR zLzLA-A 4.10E-05 3.51E-04 1.19E-03 1.0004 85.4945 WBN.1-BKR-2 L2-A2-A BREAKER TRANSFERS O PE N CBKXOIBKR_2 L2A2lLB-A 4.10E-05 3.51E-04 1.19E-03 1.0004 85.4946 wB N B KR-2 L2-A2l 1 B-A B R EAKE R TRAN S F E RS O p E N BUSFROBDL 2361-D 8.68E-05 3.76E-O4 6.O2E-04 1.0004 44,2627 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MISSION TlME (20 HOURS)

BUSFROBD 2351-D L.74E-06 7.26E-05 5.82E-04 1.0001 42.8085 Failure of 125V DC Battery Board 1 HORXO1SV 0670s06A 3.19E-08 1.24E-06 5.41E-04 L

39.8671 MANUAL VALVE WBN-1-57-505A TRANSFERS OPEN (FLOW DTvERSTON)

BCH FROCH RG2351-D r.22E-04 4.38E-03 5.00E-04 1.0044 36.9404 WBN-O-CHRG-236-OOO1-D BATTERY CHARGER FAILS cBKXOoBKR_236L1225-D 4.10E-06 L.42E-04 4.80E-04 1.0001 35.4841 Normal Supply Breaker 226 from 125V Vital Batt Chgr 1 cBKXO0SW_236L/SW1-S 4.10E-05 L.42E-04 4.80E-04 1.0001 35.4841 480V AC Vital Disconnect Panel 1 Switch 0-SW-236-000USW1-S Transfers Open FUSFP0FU 236L(2LO-D 3.12E-05 L.O7E-04 4.78E-O4 1.0001 35.3447 SUPPLY BREAKER MAIN LINE FUSE zLA BUSFROBDL 2362-E 8.58E-05 2.89E-04 4.64E-04 1.0003 34.3331 BUS FAIIs TO OPERATE OVER REMAINDER OF 24 HOUR MISSION TlME (20 HOURS)

BUSFRlBD 211B-B 1.04E-05 3.2LE-O4 4.28E-44 1.0003 31.7818 SHUTDOWN BOARD 1B-B FAlLS (1-BD-211-B-B)

BUSFROBD 2362-E L.74E-06 5.34E-05 4.28E-04 1.0001 3L.77L4 Failure of t25V DC Battery Board2 MORFO1FCV 05700055 9.70E-O4 2.33E-02 3.34E-04 1.0239 25.0041 Added for evaluation WBN-2-10-135 and WBN-2-11-0006 CCF U1 ESF 15V FO ALL 4.94E-07 1.08E-05 3.04E-04 t

22.8546 COMMON CAUSE 15VDC BETWEEN BUS L,2,3 AND 4 BOTH TRAIN A AND B TKURP1TANKOS3OOO4S 5.35E-08 1.00E-05 2.50E-04 1

L9.7L42 WBN-I-TAN K-063.045 RWST TANK RU PTURE MORFO2FCV 05700067 9.70E-04 L.62E-O2 2.33E-O4 1.0155 L7.7057 Added for evaluation WBN-2-10-135 and WBN-2-11-0005 BUSFR2BD 211B-B 1.04E-05 L.7LE-O4 2.?9E-04 1.0002 L7.4392 WBN-z -BD-ZLl.B-B SWITCH BOARD FAIlS DU RING OPERATION BUSFR1BD 2351.D 1.04E-05 1.55E-04 2.20E-O4 1.0002 16.8158 12OV AC VITAL INST POWER BOARD 1-I FAILS CBKXOISW 2351-D 4.10E-06 5.17E-05 2.09E-04 1.0001 16.0313 Disconnect Switch in 120V AC Vital lnst Power Board 1.-l CBKXO1XSW 2351-D 4.10E-06 5.17E-05 2.09E-04 1.0001 15.0313 Transfer Switch in 120V AC Vital lnst Power Board 1-l

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 186

Subject:

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SUMMARY

Table 75 -- Unit I Basic Event CDF lmportance RAW > 2 Event Probability R/

BB RRW RAW Description RTBFO1RTB O99OOOOA 3.70E-05 5.16E-04 1.94E-04 1.0005 L4.94 WBN-1-BKR-O99.L116ILB-A REACTOR TRIP BREAKER TRAIN A FAILS RTBFO1RTB O99OOOOB 3.70E-05 4.93E-04 1.85E-04 1.0005 L4.32,.L WBN-1-BKR-099-L116(LC-B REACTOR TRtp BREAKER TRATN B FAILs MORFO1FCV 05700057 9.70E-04 L.26E-02 1.80E-04 L.OL27 13.9385 Added for evaluation WBN-2-10-135 and WBN-2-1L-0006 XRFFR1OXF 2L2B1.B 2.L7E-OS 2.70E-O4 L.73E-O4 1.0003 13.4509 6.9KV TO 48OV TRANSFORMER 1B1B (1-OXF-2L2-81-B)

BUSFR1BD 2LZBL.B 1.04E-05 L.23E-04 1.64E-04 1.0001 L2.82AL 48OV SHUTDOWN BOARD 181-8 AVAILABLE PCOFR1PMP 07000515 8.67E-05 9.7LE-O4 1.56E-04 1.001 L2.204 WBN-O-PMP.O7O-0051.-S PUMP CS FAILS TO OPERATE CBKXO1BKR 2L281-B 4.10E-06 4.35E-05 1.48E-04 L

11.528 6.9KV SUPPLY BREAKER TO TRANSFORMER 1B1B (1-BKR-212-81-B) cBKXOIBKR_2 LaBL/LB-B 4.10E-06 4.36E-05 1.48E-04 1

LL.628 48OV TRANSFORMER 1BB OUTPUT BREAKER TO 48OV SDBD 181-B (1-BKR-212-BU1B-B)

XRFFR1OXF 2L282-A 2.L7E-05 2.29E-04 L.47E-04 1.0002 LL.5725 5.9KV TO 48OV TRANSFORMER 1B2B (I-OXF -2L2-82-B) FAr LS DU RING OPERATION HXRPLoHTX 07000186 1.55E-05 1.53E-04 L.45E-04 1.0002 11.53 WBN-O-HTX-O7O-0186 CCS HEAT EXCHANGER C PLUGGING BUSFR1BD 2L282-B 1.04E-05 L.O7E-04 1.43E-04 1.0001 11.2863 48OV SHUTDOWN BOARD 182-8 FAILS TO OPERATE BUSFR1MCC 21481.8 1.04E-05 L.07E-04 1.43E-04 1.0001 LL.2649 48OVAC CONT & AUX BLDG VENT BOARD 1-MCC-2L4-BOO1-B (181-8) FAlLS TO RUN BUSFR1BD 2352-E 1.04E-05 1.01E-04 1.35E-04 1.0001 L0.7044 120V AC VlTAL 1-il BUS FATLS (WBN-I-BD -235-0002 -E)

HXCRPoHTX 07000r.86 5.57E-05 5.39E-05 1.35E-04 1.0001 L0.6834 WBN-O.HTX-O7O-0185 CCS HEAT EXCHANGER C EXCESSIVE LEAKAGE/RUPTURE BCH FROCH RG2362-E L.22E-O4 1.18E-03 1.34E-04 1.0012 10.5554 CHARGER II FAILS DURING OPERATION (o-cH RG-236-0002/E)

CBKXO1BKR 2L282-B 4.10E-05 3.92E-05 1.33E-04 1

10.5534

5. 9 kV S U p p Ly TO TRA N S FO R M E R 1 82 B ( 1-B K R-2L2-82-Bl cBKXOIBKR_z LzBalLB-B 4.10E-05 3.92E-05 1.33E-04 1

10.5534 OUTPUT BREAKER TO 48OV SDBD 1B2-B

( 1-B KR -2L2-82/ LB-B) TRANSFE RS O p E N RLVPO1RFV O7OO551B s.09E-06 4.84E-05 L.32E-04 L

10.5203 1.70-5518 RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO555B 5.09E-06 4.84E-05 L.32E-04 L

10.5203 1-70-5568 RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO551B 5.09E-06 4.84E-05 1.32E-04 L

10.5203 1.70-5618 RELIEF VALVE OPENS PREMATURELY

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page: 187

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit t, 'Basic Event CtrF lmportance RAW > 2 Event ProbabiliW FY BB

.RRW RAW Deecription RLVPO1RFV O7OO555B 5.09E-05 4.84E-05 L.32E-O4 L

10.5203 L-70-565B RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO57OB 5.09E-05 4.84E-05 1.32E-04 L

10.5203 L-70-5708 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO551B 5.09E-05 4.84E-05 L.32E-O4 L

10.5203 2-70-5518 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV 07005568 5.09E-06 4.84E-05 1.32E-04 L

10.5203 2-70-5568 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV 07005618 5.09E-05 4.84E-05 L.32E-04 L

10.5203 2-70-5618 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO555B 5.09E-06 4.84E-05 1.32E-04 L

10.5203 2-70-5658 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO57OB 5.09E-05 4.84E-05 L.32E-04 1

10.5203 2-70-5708 RELIEF VALVE OPENS PREMATURELY HXRPL1HTX 07000185 1.55E-05 L.46E-04 1.32E-04 1.0001 10.4541 WBN-1-Hil-O7O-0185 CCS HEAT EXCHANGER A PLUGG!NG cBKXOISW 2352-E 4.10E-06 3.85E-05 1.30E-04 L

10.3703 Disconnect Switch in 120V AC Vital lnst Power Board 1-ll (WBN-1-SW -23s-0002 -E)

CBKXOIXSW 23s2-E 4.10E-06 3.85E-05 1.30E-04 1

10.3703 Transfer Switch in 120V AC Vital lnst Power Board 1-ll (l-XSW-23s-0002-E) cB KXO 1 B KR_2 LaBr/ L0 B-B 4.10E-05 3.80E-05 L.29E-O4 1

to.2525 48OV SDBD FDR BKR TO C&A BLD VENT BOARD 1B1-B (1-BKR -ZL2-BLI108-B) cB KXO 1 B KR_2 L4BL/ LA1-B 4.10E-06 3.80E-05 L.29E-O4 L

LO.2526 suPpLy BREAKER 1-BKR-2L4-800L/L L-B TRANSFERS OPEN HXCRP1HTX 07000L85 5.57E-05 5.01E-05 L.25E-O4 1.0001 9.992L WBN.1-HTX-O7O-0185 CCS HEAT EXCHANGER A EXCESSIVE LEAKAGE/RUPTURE RLVPOORFV O7OO527A 5.09E-05 4.54E-05 L.24E-04 L

9.9243 0-RFV-7O-527A RELTEF VALVE OPENS PREMATURELY (SPENT FUEL PIT}

RLVPO1RFV O7OOO521 5.09E-05 4.54E-05 L.24E-O4 L

9.9243 L-70-521 RELTEF VALVE OPENS PREMATURELY (WASTE GAS CoMPRESSOR HX)

RLVPO1RFV O7OOO594 5.09E-05 4.54E-05 L.24E-04 L

9.9243 L-70-694 RELIEF VALVE OPENS PREMATURELY (RCp OtL COOLER)

RLVPO1RFV O7OOO7O3 5.09E-05 4.54E-05 L.24E-O4 t

9.9243 1-RFV-70-703 RELTEF VALVE OPENS PREMATURELY (EXCESS LETDOWN HX)

RLVPO1RFV O7OOO74L 5.09E-06 4.54E-05 L.24E-O4 L

9.9243 L-7O-74r RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO1RFV O7OOO835 5.09E-06 4.54E-05 L.24E-O4 L

9.9243 1-RFV-70-835 RELTEF VALVE OPENS PREMATURELY (THERMAL BARRIER)

RLVPO1RFV O7OO551A 5.09E-06 4.54E-05 L.24E-O4 1

9.9243 1-70-551A RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO555A 5.09E-05 4.54E-05 L.24E-04 L

9.9243 1-70-555A REL!EF VALVE OPENS PREMATURELY RLVPO1RFV 0700561A 5.09E-05 4.54E-05 L.24E-O4 1

9.9243 1-70-561A RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO555A 5.09E-06 4.54E-05 L.24E-04 1

9.9243 1-70-555A RELIEF VALVE OPENS PREMATURELY

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 188

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 '- fJnit I Basic Event CDF Importance RAW > 2 Event ProbabiliW R'

BB RRW RAW Description RLVPO1RFV O7OO57OA 5.09E-05 4.54E-05 L.24E-O4 1

9.9243 L-70-570A RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO578 5.09E-05 4.54E-05 L.Z4E-04 1

9.9243 1-RFV-70-578 RELTEF VALVE OPENS PREMATURELY (NON-REGEN Hx)

RLVPO1RFV O7OO584 5.09E-05 4.54E-05 L.24E-04 L

9.9243 1-RFV-70-584 RELIEF VALVE OPENS PREMATURELY (SEAL WATER Hx)

RLVPO1RFV O7OO583A 5.09E-06 4.54E-05 L.24E-04 L

9.9243 1-RFV-70-683A RELTEF VALVE OPENS PREMATURELY (THERMAL BARRTER)

RLVPO1RFV 07006838 5.09E-05 4.54E-05 L.24E-04 L

9.9243 1-RFV-70-6838 RELTEF VALVE OPENS PREMATURELY (THERMAL BARRTER)

RLVPO1RFV O7OO683C 5.09E-05 4.54E-05 L.24E-44 1

9.9243 1-RFV-70-683C RELTEF VALVE OPENS PREMATURELY (THERMAL BARRIER}

RLVPO1RFV O7OO683D 5.09E-05 4.54E-05 L.24E-O4 L

9.9243 1-RFV-70-583D RELTEF VALVE OPENS PREMATURELY (THERMAL BARRTER)

RLVPO1RFV O7OO729A 5.09E-05 4.54E-05 L.24E-04 L

9,9243 L-70-729A RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO1RFV O7OO729B 5.09E-05 4.54E-05 L.24E-04 1

9.9243 L-70-729B RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO1RFV O7OO729C 5.09E-05 4.54E-05 L.24E-04 1

9.9243 r-70-729C RELTEF VALVE OPENS PREMATURELY (SAMPLE HX) cBKXO0BKR_z3521226-E 4.10E-06 3.48E-05 1.18E-04 I

9.4796 Normal Supply Breaker 226 from 125V Vital Batt Chgr 2 cBKXO0SW_2352/SW1-S 4.10E-06 3.48E-05 1.18E-04 L

9.4796 480VAC Vita! Disconnect Panel (0-SW-235-0002/SW1-S)

FUSFPoFU_236212L0-E 3.12E-05 2.58E-05 1.15E-04 L

9,2648 SUPPLY BREAKER MAIN LINE FUSE zLO PCOFR1PMP 0700046A 8.57E-05 6.68E-04 1.07E-04 1.0007 8.7028 WBN.1-PMP.O7O-0046-A PUMP 1A-A FAILS TO OPERATE MORXC1FCV 06700L43 9.77E-07 7.48E-O6 1.05E-04 L

8.5553 WB N-1-FCV-067 -0L43-A VALVE TRANSFERS CLOSED SMPPL1STN SUMP1 2.15E-06 1.64E-05 1.06E-04 L

8.5848 suMP sugfloN STRAlNERS PLUGGED (LLOCA OR MLOCA)

MOCXC1FCV 06700223 6.78E-07 5.10E-06 1.05E-04 L

8.5251 Motor operated valve transfer closed (clean water)

MOCXC1FCV 06700478 6.78E-07 5.10E-05 1.05E-04 L

8.5251 Motor operated valve transfer closed (clean water)

MOCXC2FCV 06700223 6.78E-07 5.10E-06 1.05E-04 L

8.5251 Motor operated valve transfer closed (clean water) cBKXOoBKR_235L1204-D 4.10E-05 2.78E-05 9.41E-05 1

7.76L6 125VDC SUPPLY BREAKER TO 5.9KV SDBD 1A-A cKcFolcKV 05300s86 1.30E-05 i 8.75E-05 9.37E-05 1.0001 7.737 WBN-1-CIU-063-0586-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 06300587 1.30E-05 8.75E-05 9.37E-05 1.0001 7.737 WBN-1-CKV-063-0587-S CHECK VALVE FAILS TO OPEN ON DEMAND

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 189

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75

  • Unit tr,Bestc Event CDF Importance RAW > 2 Event ProbabiliW R'

BB RiBW RAW Description cKcFolcKV 05300s88 1.30E-05 8.76E-05 9.37E-05 1.0001 7.737 WBN-1-CKV-053-0588-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 05300589 1.30E-05 8.75E-05 9.37E-05 1.0001 7,737 WBN-1-CIry-053-0589-S CHECK VALVE FAILS TO OPEN ON DEMAND SRVSR1SRV 05800553 7.95E-04 5.30E-03 9.27E-O5 1.0053 7.657L SAFEW VALVE FAILS TO RESEAT AFTER STEAM RELIEF W8N.1.58-563 SRVSR1SRV 05800554 7.95E-04 5.30E-03 9.27E-05 1.0053 7.657L SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN-1-58.

564 SRVSR1SRV 05800555 7.95E-O4 5.30E-03 9.27E-05 1.0053 7.557L SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN-1-68.

55s FUSFP0FU_23 6Ll20L-D 3.12E-06 2.08E-05 9.25E-05 L

7.6522 125VDC SUPPLY FUSE zOL MORXCoFCV 06700L44 9.77E-O7 5.41E-05 9.14E-05 1

7.5675 WBN-O-FCV-067 -0L44-B MOV TRANSFERS CLOSE D HORXC1FCV 06700L27 7.49E-O8 4.42E-07 8.21E-05 L

6.9046 WBN-1-FCV-067 -0L27 TRANSFERS CLOSED ( LO/PR)

BUSFR1MCC ZL4AL-A 1.04E-05 5.05E-05 8.10E-05 1.0001 5.8205 48OVAC CONT & AUX BLDG VENT BOARD 1-MCC-2L4-AOO1-A (1A1-A) FATLS TO RUN HORXC1FCV 06700022 7.49E-08 4.28E-O7 7.95E-05 L

6.7L72 ERCW 1A SUPPLY HDR MOV WBN-1-FCV-57-Z2TRANSFERS cLosED (LOIPR)

HORXC1FCV 06700081 7.49E-O8 4.28E-O7 7.95E-05 L

6.7L72 LOCKED OPEN WBN-1-FCV-67-81 TRANSFERS CLOSED (LO/PR)

HORXCIISV 0570505A 7.49E-08 4.28E-07 7.95E-05 1

6.7L72 MANUAL VALVE WBN -L.67-505A TRANSFERS CLOSED RLVFO1RFV 0620636 2.47E-03 1.40E-02 7.87E-05 L.OL42 6.6443 WBN-1-RFV-052-0535.S RELIEF VALVE FAILS TO OPEN AOCXO1FCV 05200s3 5.09E-04 3.42E-03 7.80E-05 1.0034 6,607L WBN-I-FCV -052-0053 FCV TRANSFERS OPEN SIPHONING FLOW FROM SEAIS FNSFR1FAN O3OOO183 2.56E-03 L.49E-02 7.78E-05 L.0151 6.5798 CCP A ROOM COOLER FAN FAILS DURING OPERATION cB KXO 1 B KR_z LaALI L0 B-A 4.10E-06 2.26E-05 7.67E-05 L

5.515 48OV SDBD FDR BKR TO C&A BLD VENT BOARD 1A1-A (1-BKR -2L2-A1I10B-A) cB KXO 1 B KR_z L4ALI LA1-A 4.10E-06 2.26E-05 7.57E-O5 L

6.515 su PPLY BREAKER I-BKR -2L4-A001/1A1-A TRANSFERS OPEN PCCFR1PMP O52O1O8A 8.79E-05 4.78E-O4 7.55E-05 1.0005 5.4358 WBN-1-PMP-062-O1O8.A CCP 1A-A FAILS DURING OPERATION HOCXC1FCV 07000008 7.49E-08 4.03E-07 7.48E-05 1

6.3777 WBN-1-FCV-070-0008-A TRANSFERS CLOSED (LOCKED OPEN wtTH POWER REMOVED)

HOCXC1FCV 07000025 7.49E-09 4.03E-07 7.48E-05 L

6.3777 w B N FCV-07 O-0025-A TRANS F E RS CLOS E D ( LO CKE D O p E N wrTH POWER REMOVED)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 190

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit I Basic Event CDF Importance RAW > 2 Event ProbabiliW Fl' BE RRW RAW Description HOCXC1 sv 07000510 7.49E-08 4.03E-07 7.48E-05 L

6,3777 WBN-1-ISV-O7O-0510-A VALVE TRANSFERS CLOSED HOCXC1 sv 0700s44A 7.49E-08 4.03E-O7 7.48E-05 1

6,3777 WBN-1-ISV-O7O-0544A-S VALVE TRANSFERS CLOSED HOCXC1 sv 0700544c 7.49E-O8 4.03E-07 7.48E-05 1

6.3777 WBN-1.ISV-O7O-0544C-A VALVE TRANSFERS CLOSED HORXC1 sv 06701009 7.49E-08 4.03E-07 7.48E-05 L

6.3777 WBN-1-ISV-057-1009 VALVE TRANSFERS CLOSED HORXC1 sv 05701010 7.49E-08 4.03E-O7 7.48E-05 L

6.3777 WB N !SV-057 -LOLO VALVE TRANS FE RS CLOS E D HORXC2FCV 06700022 7.49E-08 4.03E-07 7.48E-05 L

6.3777 ERCW 1A SUPPLY HDR MOV WBN-2-FCV.57-22 TRANSFERS cLosED (LO/PR)

HORXCZF$l 06700081 7.49E-O8 4.03E-O7 7.48E-05 1

6.3777 AUX BLDG HDR A ISO MOV WBN-2-FCV-67-SLTRANSFERS cLosED (LO/PR)

HORXCZF$( O6700L27 7.49E-O8 4.O3E-O7 7.48E-05 L

6.3777 WBN-2-FCV-067 -0L27 TRANSFERS CLOSE D ( LOlpR)

HORXC2TSV 0670s0sA 7.49E-08 4.03E-07 7.48E-05 L

6.3777 MANUAL VALVE WBN-2-57.505A TRANSFERS CLOSED HXCPL1HTX 03000183 1.55E-05 8.07E-05 7.25E-05 1.0001 6.zLM WBN-I-CLR -O3O-0183 CVCS CCP A ROOM COOLER HEAT EXCHANGER PLUGS HXCPLTHTX 0620108A 1.55E-05 8.07E-05 7.25E-05 1.0001 6.zLM CCP 1A-A LUBE OIL COOLER PLUGS HXCPL1HTX 05201088 1.55E-05 8.07E-05 7.25E-05 1.0001 6.2L4y'.

CCP 1A-A GEAR OIL COOLER PLUGS RLVSO1RFV 0520636 5.09E-05 2.51E-05 7.L3E-05 L

6.L279 WBN-2-RFV-052.0535-S RELI EF VALVE TRANSFERS CLOSED AOCXC1FCV 0620009 4.37E-06 2.23E-05 7.09E-05 T

5.1002 WBN-I-FCV -O52.OOO9 AOV TRANSFERS CLOSED AOCXC1FCV 0520022 4.37E-06 2.23E-05 7.09E-05 L

6.1002 WBN-I-FCV -062-0022 AOV TRANSFERS CLOSED AOCXC1FCV 0620035 4.37E-06 2,23E-05 7.09E-05 L

6.1002 WBN-I-FCV -062-0035 AOV TRANSFERS CLOSED AOCXC1FCV 0620048 4.37E-06 2.23E-05 7.09E-05 L

6.1002 WBN.I-FCV -062-0048 AOV TRANSFERS CLOSED AOCXC1FCV 0620093 4.37E-Oo 2.23E-05 7.09E-05 1

6.1002 WBN-I-FCV -052-0093 AOV TRANSFERS CLOSED HXCRP1HTX 03000183 5.57E-05 2.82E-05 7.04E-05 L

5.0575 WBN-I:CLR -O3O-0183 CVCS CCP A ROOM COOLER HEAT EXCHANGER RUPTURES HXCRP1HTX 0620108A 5.57E-06 2.82E-05 7.04E-05 L

5.0576 CCP 1A.A LUBE OlL COOLER RUPTURES HXCRP1HTX 06201088 5.57E-05 2.82E-05 7.04E-05 T

6.0576 CCP 1A-A GEAR OIL COOLER RUPTURES AORXC1FCV 05700168 4.37E-05 2.19E-05 6.98E-05 L

5.0155 AOV FCV-57-158 TRANSFERS CLOSED (LOCKED OPEN POWER REMOVED)

HOCXCIrSV 07005034 7.49E-O8 3.76E-07 5.98E-05 t

5.0155 WBN-1-ISV-O7O-O5O3A-A PUMP 1A.A SUSNON VALVE TRANSFERS CLOSED HOCXCIlSV 0700505A 7.49E-09 3.76E-07 5.98E-05 L

6.0155 WBN-1-ISV.O7O-O5O5A-A PUMP 1A-A DISCHARGE VALVE TRANSFERS CLOSED

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 191

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- unit 1 Baeic Event GDF lmportance RAW > 2 Event PrsbabiliU FV BB RRW RAW Description FLTPLlFLTROS2OO9T 2.37E-06 1.19E-05 6.97E-05 1

6.0092 WBN-1-FLTR-052-0097 SEAL WATER INJECTION FILTER PLUGS HOCXC1 NJ 0520s55 7.49E-08 3.55E-07 6.50E-05 1

5.7467 WBN-l.!NJ.O52-0556-S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 NJ 0620557 7.49E-08 3.55E-07 5.60E-05 L

5.7457 WBN-I-I NJ-052-O557.S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 NJ 0620558 7.49E-O8 3.55E-O7 6.60E-05 L

5.7467 WBN-1-INJ-052-0558.S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 NJ 0520559 7.49E-O8 3.55E-O7 5.50E-05 L

5.7467 WBN-1.INJ-062-0559-S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 sv 0620535 7.49E-08 3.55E-07 6.60E-05 L

5.7467 WBN-1-ISV-052-0535.S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 sv 0520s35 7.49E-08 3.55E-O7 5.50E-05 1

5.7467 WBN-1-!SV-052-0535-S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 sv 0620548 7.49E-08 3.55E-O7 5.60E-05 L

5.7467 W B N I SV-05 2-O548-S MAN UAL VALVE TRAN S FE RS CLOS E D HOCXC1 sv 0620550 7.49E-08 3.55E-07 5.50E-05 L

5.7467 WBN-1-ISV-062-0550-S MANUAL VALVE TRANSFERS CLOSED HOCXC1 sv 0620s64 7.49E-08 3.55E-07 5.60E-05 1

5.7467 W B N ISV-052-0564-S MAN UAL VALVE TRA N S F E RS CLOS E D HOCXC1 sv 0620s6s 7.49E-08 3.55E-07 6.60E-05 1

5.7467 WBN-1-ISV-052-0565-S MAN UAL VALVE TRANSFERS CLOSED HOCXC1 sv 0620556 7.49E-08 3.55E-07 6.50E-05 L

5.7467 WBN-1-ISV-052-0555-S MANUAL VALVE TRANSFERS CLOSED HOCXC1 sv 0620s57 7.49E-08 3.55E-07 6.50E-05 L

5.7467 WB N ISV-05 2-0567-5 MAN UAL VALVE TRA N S FE RS CLOS E D HORXC1FCV 06700024 7.49E-08 3.53E-O7 6.55E-05 L

5.7L45 ERCW 18 SUPPLY HDR MOV WBN.1-FCV-57-24 TRANSFERS cLosED (LOIPR)

HORXC1FCV 05700082 7.49E-08 3.53E-O7 5.55E-05 L

5.7L45 LOCKED OPEN WBN-1.FCV-67-82 TRANSFERS CLOSED HORXC1FCV 05700128 7.49E-08 3.53E-07 5.55E-05 L

5.7L45 MOV W B N FCV-57 -L28 TRAN S F E RS CLOS E D ( LO/p R)

HORXCIISV 06705058 7.49E-08 3.53E-07 6.56E-05 1

5.7L45 MANUAL VALVE WBN-1-67.5058 TRANSFERS CLOSED cKcxclcKv 0520052s 4.94E-08 2.28E-O7 5.41E-05 1

5.5108 W B N.I.CKV.O 52-0525-A CH ECK VA LVE TRAN S F E RS CLOS E D cKcxclcKv 0620550 4.94E-08 2.28E-07 5.41E-05 L

5.5108 WBN-1.CIU.052-0560-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0620561 4.94E-08

?.28E-O7 5.41E-05 L

5.5108 WBN-1-CKV-052-0561-S CHECK VALVE TMNSFERS CLOSED cKcxclcKv a620562 4.94E-08 2.28E-07 6.41E-05 L

5.5108 WBN-1-CKV-052-0552-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0620553 4.94E-08 2.28E-07 5.41E-05 1

5.5108 WBN.1.CKV.O62-0553-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0620576 4.94E-08 2.28E-07 5.41E-05 1

5.5108 WB N -l-CKV-O 62-0575-5 CH ECK VALVE TRAN S F E RS CLOS E D cKcxclcKv 0620577 4.94E-08 2.28E-O7 5.41E-05 L

5.5108 WB N-I-CKV-O 62-0577-5 CH ECK VALVE TRANS F E RS CLOS E D cKcxclcKv 0520578 4.94E-08 2.28E-07 6.41E-05 L

5.5108 WB N-I-CKV-O 62-0578-5 CH ECK VA LVE TRAN S F E RS CLOS E D cKcxclcKv 0620579 4.94E-08 2.28E-07 5.41E-05 L

5.5108 WBN-1-CKV-062-0579-S CH ECK VALVE TRANSFERS CLOSED cKcxclcKv 0520592 4.94E-08 2.28E-07 5.41E-05 1

5.6108 WBN-1-CKV.O52-0592-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0520593 4.94E-08 2.28E-07 6.41E-05 L

5.6108 WBN-1-CKV-062-0593-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0620594 4.94E-08 2.28E-O7 6.41E-05 L

5.6108 WBN-1-CKV-052-0594-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 0520595 4.94E-08

?.28E-O7 5.41E-05 L

5.5108 WBN-1-CKV-052-0595-S CHECK VALVE TRANSFERS CLOSED

t--'--'-"-""-"-'-'-'ttt--l I subject WBN PRoBABILISTIC RISK ASSESSMENT -

SUMMARY

I Table 75 -- Unit I Basic Event CDF lmpoilance RAW > 2 Event Probabiliw R/

BB BRITI RAW Description HOCXC1 sv 06200509 7.49E-09 3.45E-07 5.41E-05 1

5.6108 WBN SV-052-0509-A MANUAL VALVE TRANSFERS CLOSED HOCXC1 sv 06200527 7.49E-08 3.45E-07 5.41E-05 L

5.6108 WBN-1. SV.O52-0527-A MANUAL VALVE TRANSFERS CLOSED HOO(C1 sv 07000800 7.49E-O8 3.45E-07 5.41E-05 L

5.5108 WBN.1. SV-O7O-O8OO MANUAL VALVE TRANSFERS CLOSED HOCXC1 sv 07000801 7.49E-08 3.45E-07 6.41E-05 L

5.5108 WBN SV.O7O-0801 MANUAL VALVE TRANSFERS CLOSED HOCXCIlSV 07005s7A 7.49E-09 3.45E-07 5.41E-05 L

5.6108 WBN-1-ISV-O7O-0557A-A MAN UAL VALVE TRANSFERS CLOSED HOCXC1THV 0700554A 7.49E-08 3.45E-07 5.41E-05 L

5.6108 WBN-1-THV-O7O-0554A MAN UAL VALVE TRANSFERS CLOSED HORXCIlSV 0570500A 7.49E-09 3.45E-07 5.41E-05 1

5.5108 WBN-1-ISV-057-O6OOA-A MAN UAL VALVE TRANSFERS CLOSED HORXCIISV 0570502A 7.49E-09 3.45E-07 6.41E-05 L

5.6108 W B N I SV-067 -0602A-A MAN UA L VA LVE TRAN S FE RS CLOS E D HORXC1THV 0670601A 7.49E-08 3.45E-07 5.41E-05 L

5.6108 WBN-1-THV-067-O5O1A-A THV VALVE TRANSFERS CLOSED HORXOzTSV 0670505A 3.19E-09 L.46E-07 6.34E-05 L

5.5503 MANUAL VALVE WBN-2-57.506A TRANSFERS OPEN (FLOW DTVERStON) cKcxclcKv 0700504A 4.94E-09 2.25E-07 5.33E-05 L

5.5522 WBN-1-CKV-O7O-O5O4A-A CHECK VALVE TRANSFERS CLOSED PCOFR1PMP OTOOO51SIET 8.57E-05 3.92E-04 6.30E-05 1.0004 5.5259 WBN-O-PMP-O7O.OO51-S PUMP cS FAILS TO OPERATE HORXColSV 05700545tE 2.73E-05 L.23E-04 6.27E-05 1.0001 5.509 WBN-O.ISV.O67 -0546.8 VALVE TRANSFERS CLOSE D HXRPLOHTX O7OOO185IET 1.55E-05 5.96E-05 6.25E-05 1.0001 5.4962 WBN.O-HTX-O7O-0186 CCS HEAT EXCHANGER C PLUGGING HXCRPoHTX 07000185tET 5.57E-05 2.46E-05 5.15E-05 1

5.42L9 WBN-O-HTX-O7O-0186 CCS HEAT EXCHANGER C EXCESSIVE LEAKAGE/RUPTURE cKcxclcKv 06300s86 4.94E-08 2.L8E-O7 5.12E-05 L

5.402L WBN-1-CKV-063-0586-S CH ECK VALVE TRANSFERS CLOSED cKcxclcKv 05300587 4.94E-09 2.L8E-O7 6.12E-05 L

5.402L WBN-1-CKV-053-0587-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 06300588 4.94E-08 2.L8E-07 6.12E-05 L

5.402L WBN-1-CKV-053-0588-S CHECK VALVE TRANSFERS CLOSED cKcxclcKv 05300s89 4.94E-09 2.LgE-07 6.12E-05 L

5.402L WBN-1-CKV-053-0589-S CHECK VALVE TRANSFERS CLOSED HOCXC1THV 06300582 2.81E-09 L.24E-07 5.12E-05 L

5.402L WBN-1-THV-063-0582-S TRANSFERS CLOSED (LOCKED THROTTLE)

HOCXC1THV 06300583 2.81E-08 L.24E-07 5.12E-05 L

5.402L WBN-1-THV-053-0583-S TRANSFERS CLOSED (LOCKED THROTTLE)

HOO(CITHV 05300s84 2.81E-08 L.24E-07 5.12E-05 L

5.402L WBN-1-THV-053-0584-S TRANSFERS CLOSED ( LOCKED THROTTLE)

HOCXC1THV 05300585 2.81E-08 L.24E-07 6.12E-05 L

5.402L WBN-1-THV-053-0585-S TRANSFERS CLOSED (LOCKED THROTTLE)

PCOFD1PMP 07000515 1.07E-03 4.57E-03 5.94E-05 1.0045 5.?67 WBN-O-PMP-O7O-0051-S PUMP cS FAILS TO START ON DEMAND BCH FROCH RG2354-G L.22E-O4 5.11E-04 5.83E-05 1.0005 5.L924 WBN-0-CHRG-235 -0OO4lG CHARGER FATLS DU RING OPERATlON

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 193

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit 1 Basic Event GDF lmportance RAW > 2 Event Probabiliw RI BB RRW RAW Description XRFFR2OXF 2L282-B 2.L7E-05 8.71E-05 5.59E-05 1.0001 5.0153 TRANSFO RM E R WB N-2-OXF -2L2-82-B FA! LS TO O P E RATE BUSFR2BD 2L282-B 1.04E-05 3.81E-05 5.09E-05 L

4.662 48OV SHUTDOWN BOARD 282.8 BUS FAILURE cKcFoocKV 07000s04 1.30E-05 4.72E-05 5.05E-05 L

4.6339 WBN-O.CKV-O7O-0504 CHECK VALVE FAILS TO OPEN ON DEMAND MORFOaFCrI 05700066 9.70E-04 3.50E-03 5.03E-05 1.0035 4.5089 Added for evaluation WBN-2-10-135 and WBN-2-L1-0005 BUSFROBDL 2364-G 8.68E-05 3.04E-05 4.87E-05 L

4.5027 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MISSION TIME (20 HOURS)

BATFROBAT 2362-E 7.44E-O6 2.57E-05 4.81E-05 L

4.4542 BATT lr FAlLS DURTNG OPERATlON (0-BAT-236-2-EI PTSFII.PMP OO3OO1AS 1.05E-02 3.59E-02 4.78E-05 1.0373 4.4035 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN.1.-3-1AS PTSFR1PMP OO3OO1AS 1.51E-03 5.45E-03 4.73E-05 1.0055 4.393 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS BUSFROBDL 2353-F 8.58E-06 2.87E-Os 4.50E-05 L

4.3079 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MISSION TrME (20 HOURS)

HOO(CoFCV 07000012 7.49E-08 2.38E-O7 4.43E-05 L

4.L829 WBN-0-FCV-070-0012-B TRANSFERS CLOSED (MOV LOCKED OPEN WITH POWER REMOVED)

HOCXCoFCV 07000022 7.49E-08 2.38E-07 4.43E-05 1

4.L829 w B N FCV-07 0-0022-8 TRAN S FE RS CLOS E D ( M OV LO CKE D OPEN WITH POWER REMOVED)

HOCXCoTSV 07000503 7.49E-08 2.38E-07 4.43E-05 L

4.L829 WBN-O-ISV-O7O-0503 PUMP CS SUCTION VALVE TRANSFERS CLOSED HOCXCoTSV 07000s05 7.49E-08 2.38E-07 4.43E-05 L

4.L829 WBN-0.!SV-O7O-0505 PUMP CS DISCHARGE VALVE TRANSFERS CLOSED HOO(ColSV 07000510 7.49E-08 2.38E-O7 4.43E-05 L

4.L829 WBN-0. SV-O7O-0510-B VALVE TRANSFERS CLOSE D HORXColSV 05700546 7.49E-08 2.38E-07 4.43E-05 L

4.L829 WBN-0. SV-057-0545-B VALVE TRANSFE RS CLOSE D HORXCoISV 06701009 7.49E-08 2.38E-O7 4.43E-05 L

4.L829 WBN-O-SV-067-1009-B VALVE TRANSFE RS CLOSE D HORXCoISV 05701010 7.49E-08 2.38E-07 4.43E-05 1

4.L829 WBN-O-SV.O67-1O1O.B VALVE TRANSFERS CLOSED cB K FO 1 B KR_2 LLLT L6 I 16-A 2.55E-03 8.12E-03 4.43E-05 1.0082 4.L765 w B N B K R-2 LL-L7 L6 / 16 -A B R EA KE R FA I LS TO O p E N DGGFD1GEN 0821A-A 7.15E-03 2.28E-02 4.43E-05 1.0233 4.L629 DG 1A-A FAILS TO START AND RUN FIRST HOUR FNSFD1FAN 030459 4.80E-03 1.53E-Oz 4.42E-05 1.0155 4.1519 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR SEQFDlA.A 3.33E-03 1.05E-02 4.41E-05 L.OLO7 4.1589 SEQUENCER 1A-A FAILS (Unknown UNID)

DAOFO1FCO 030443 1.02E-03 3.20E-03 4.36E-05 1.0032 4.1305 SUPPLY DAMPER T-FCO-30.443 OPENS DAOFO1FCO 030459 1.02E-03 3.20E-03 4.35E-05 1.0032 4.1305 EXHAUST FAN DAMPER 1-FCO-30-459 FAILS TO OPEN

Table 75 -- Unit I Basic Event CDF lmportance RAUU > 2 Event ProbabiliU R/

BB RRW RAW Descrlptlon HORXOIISV 5705058 3.19E-08 9.99E-08 4.35E-05 L

4.L283 MANUAL VALVE WBN-2-67-5058 TRANSFERS OPEN (FLOW DTVERStON)

HOCXC1FCV 0700007s 7.49E-08 2.29E-07 4.26E-05 1

4.0595 WBN-1-FCV-070-0075-B TRANSFERS CLOSED ( LOCKED OPEN wtTH POWER REMOVED)

BUSFROBD 2362E IE 3.80E-03 1.15E-Oz 4.22E-05 L.ALL7 4.0243 L25V DC VITAL BATTERY BOARD II FAIIS DURING OPERATION BCH FROCH RG2363-F L.22E-04 3.55E-04 4.15E-05 1.0004 3.992L CHARGER rrr FATLS DURTNG OPERATlON(o-CHRG-235-0003/F)

CBKXO2BKR 2L282-B 4.10E-06 L.22E-05 4.14E-05 L

3.9762

5. 9 KV B R EA KE R W B N B KR -2L2-82-B TRA NS FE RS O P E N cBKXO2BKR_2 LZB2lLB-B 4.10E-06 L.22E-05 4.14E-05 L

3.9762 w B N B KR-2 L2-82/ 1 B-B B REAKE R TRAN S F E RS O p E N BUSFR2BD 211A-A 1.04E-05 3.09E-05 4.L3E-05 L

3.9673 SHUTDOWN BOARD 2A-A FATLS (2-BD-211-A-A) cBKXOoBKR_23641226-G 4.10E-05 1.20E-05 4.05E-05 L

3.9153 Normal Supply Breaker 225 from L25V Vital Batt Chgr 4 cBKXOoSW_2364/SW1-S 4.10E-05 1.20E-05 4.05E-05 L

3.9153 wBN-0-sw-236-0aa4lsw1-s swtTcH TRANSFERS OPEN FNSFR1FAN 030459 2.55E-03 7.50E-03 3.97E-05 L.0077 3.8434 EXHAUST FAN 1-FAN.3O-459 FAILS TO RUN DGGFR1GEN 0821A-A L.24E-02 3.57E-02 4.00E-05 L.037 3.843 DG 1A-A FAILS TO RUN XRFFR2OXF 2L2A2-A 2.L7E-05 5.14E-05 3.94E-05 1.0001 3.832 6.9kV I 480V TRANSFO RM ER 2A2A (2-OXF-2L2-A002-A)

FANFR1FAN 030491 2.59E-04 7.L2E-04 3.82E-05 1.0007 3.7469 DG r.A-A ROOM ELEC PANELI COMBUSTTON AtR FAN (WBN-l-FAN-30-491)

FUSFP0FU 236412L0-c 3.12E-06 8.39E-05 3.74E-05 L

3.6895 SUPPLY BREAKER MAIN LINE FUSE zLO cKcxcocKv 07000504 4.94E-08 L.32E-07 3.72E-05 L

3.5705 WBN-O-CKV-O7O-0504 CH ECK VALVE TRANSFERS CLOSED BUSFR2BD 2L2A2-A 1.04E-05 2.72E-05 3.64E-05 1

3.6155 48OV SHUTDOWN BOARD 2A2-A BUS FAILS TO OPERATE PRVFC1PCV 05800334 1.09E-03 2.77E-03 3.54E-05 1.0028 3.54L2 PORV 1-PCV 58-334 FAILS TO CLOSE ON DEMAND PRVFC1PCV 0680340A 1.09E-03 2.75E-03 3.51E-05 1.0028 3.523 PORV 1-PCV 58-340A FAILS TO CLOSE ON DEMAND HEXPL1HTX O82O72OA1.A 1.55E-05 3.65E-05 3.29E-05 1

3.3535 HEAT EXCHANGER 1A1 PLUGS HEXPL1HTX O82O72OA2-A 1.55E-05 3.65E-05 3.29E-05 L

3.3635 HEAT EXCHANGER LAz PLUGS MOO(CIFCV 07000003 4.23E-09 1.00E-07 3.29E-05 L

3.3625 WBN-1-FCV-O7O-OO3 TRANSFERS CLOSED BUSFROBD 2353-F L.74E-06 4.01E-05 3.21E-05 1

3.3111 Failure of 125V DC Battery Board 3 cBKXOoBKR_23631226-F 4.10E-06 9.13E-06 3.10E-05 L

3.2252 Normal Supply Breaker 226 from 125V Vita! Batt Chgr 3 cBKXO0SW_2353/SW1-S 4.10E-05 9.13E-06 3.10E-05 L

3.2252 480V AC Vital Disconnect Panel lll Switch 0-SW-235-0003/SWL-S Transfers Open CBKXOzBKR 2L2A2-A 4.10E-05 9.13E-05 3.10E-05 L

3.2252 5.9KV SUPPLY TO 2A2A (2-B KR -2L2-A2-A) TRANSFERS O PEN

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 195

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit 1 Basic Event CDF lmpoftance RAW > 2 Event ProbahiliW RI BB RRW RAW Description cBKXO2BKR_2 L2A2lLB-A 4.10E-06 9.13E-05 3.10E-05 1

3.2252 48OV SDBD 2A2-A SUPPLY BREAKER (2-BKR -2L2-A2/ LB-A) TRANS FE RS O p E N BATFROBAT 236L-D 7.44E-O5

.65E-05 3.09E-05 1

3.2244 BATT I FAlLS DURTNG OPERATlON (0-BAT-236-1-D) cKRRrocKV 0570503FlE 2.59E-04 5,7LE-04 3.06E-05 1.0005 3.2023 DISCHARGE CHECK VALVE 5O3F GROSS REVERSE LEAKAGE WBN.

0-57-503F CKRRIoCKV 0570s03HrE 2.59E-04 5.7LE-O4 3.05E-05 1.0005 3.2023 DISCHARGE CHECK VALVE 5O3H GROSS REVERSE LEAKAGE WBN-0-57-s03H HEXRPIHD( O82A72OA1-A 5.57E-06 1.18E-05 2.94E-05 L

3.LL32 HEAT EXCHANGER 1A1 RUPTURES HEXRPIHD( O82O72OA2-A 5.57E-06 L.L8E-05 2.94E-05 L

3.LL32 HEAT EXCHANGER IA2 RUPTURES BUSFROBD 2354-G L.74E-O6 3.63E-06 2.91E-05 1

3.0905 Failure of L25V DC Battery Board 4 FUSFP0FU 2363/2LO-F 3.12E-06 6.44E-06 2.87E-Os L

3.0533 SUPPLY BREAKER MAIN LINE FUSE zLO cB KFO 1 B KR_2 LLLT 28 l L6-B 2.55E-03 5.14E-03 2.80E-05 1.0052 3.0101 WBN-1.BKR-2LL-L728IL6B BREAKER FAILs TO OPEN DGGFD1GEN 08218-8 7.15E-03 L.43E-02 2.78E-05 1.0145 2.98L2 DG 1B.B FAILS TO START AND RUN FIRST HOUR FNSFD1FAN 030451 4.80E-03 9.55E-03 2.77E-05 1.0095 2.98 BOARD ROOM EXHAUST FAN FAIls TO START OR RUN FIRST HOUR SEQFDlB-B 3.33E-03 5.60E-03 2.76E-05 1.0065 2.9764 SEQUENCER 1B-B FAILS (Unknown UNID) cKcFolcKV 06300560 1.30E-05 2.55E-05 2.72E-05 L

2,9577 WBN-1.CKV-053-0550-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 05300s51 1.30E-05 2,55E-05 2.72E-05 L

2.9577 CHECK VALVE 53-551 FAILS TO OPEN ON DEMAND cKcFolcKV 05300562 1.30E-05 2.55E-05 2.72E-05 1

2.9577 CHECK VALVE 53-562 FAILS TO OPEN ON DEMAND cKcFolcKV 06300553 1.30E-05 2.55E-05 2.72E-05 1

2.9577 CHECK VALVE 53.563 FAILS TO OPEN ON DEMAND DAOFO1FCO 030445 1.02E-03 1.99E-03 2.7LE-05 1.002 2.947 SUPPLY DAMPER 1-FCO-30-445 OPENS DAOFO1FCO 030461 1.02E-03 1.99E-03 2.7LE-O$

1.002 2.947 EXHAUST FAN DAMPER 1-FCO-30-461 FAILS TO OPEN PCOFD1PMP O7OOO45A 1.07E-03 2.05E-03 2.67E-05 1.0021 2.9L63 WBN-1.PMP-O7O-0045-A PUMP 1A-A FAILS TO START ON DEMAND MORXC1FCV 06765 9.77E-O7 1.84E-06 2.61E-05 L

2.8796 1-Fq/-57-56 MOV TRANSFERS CLOSED cKcFolcKV 05300s10 1.30E-05 2.25E-05 2.4LE-05 1

2.730L WBN-1-CKV-053.0510-S CHECK VALVE FAI1S TO OPEN ON DEMAND cKcFolcKV 05300551 1.30E-05 2.25E-05 2.41E-05 L

2.730L WBN-1-CKV-063-0551.S CHECK VALVE FAILS TO OPEN ON DEMAND

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 196

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit I Basic Event GDF lmpoilance RAW > 2 Event ProbabiliW FY BB RBW RAW Descriptlon cKcFolcKV 06300553 1.30E-05 2.?5E-05 2.4LE-O5 L

2.730L WBN-1-CKV-053-0553-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 06300555 1.30E-05 2.25E-05 2.41E-05 L

2.730L WBN.1-CKV-053-0555-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 063005s7 1.30E-05

?.25E-05 2.41E-05 L

2.730L WBN-1-CKV.O53-0557-S CHECK VALVE FAI1S TO OPEN ON DEMAND MOCXC1FCV 05300005 6.78E-07 L,L7E.O6 2.40E-05 L

2.7237 WBN-1-FCV-053-OOO5.B MOV TRANSFERS CLOSED MOCXC1FCV 0630003 6.78E-07 1.17E-05 2.40E-05 L

2.7237 WBN-1-FCV-063-OOO3-A TRANSFERS CLOSED PU MP M IN I-FLOW HEADER (LOCKED OPEN)

MOCXC1FCV 0530022 6.78E-07 1.17E-05 2.40E-05 L

2.7237 WBN-1-FCV-063-0022-B MOV TRANSFERS CLOSED (LOCKED oPEN) cKcFolcKV 0700s04A 1.30E-05 2.23E-05 2.39E-05 L

2.7L7L WBN.1-CKV-O7O-O5O4A.A CHECK VALVE FAILS TO OPEN ON DEMAND BUSFR1MCC 2T381-B 1.04E-05 1.78E-05 2.37E-05 L

2.7066 48OV REACTOR MOV BOARD 181-8 FAILS DURING OPERATION RCPSEAL4SO 2.50E-03 4.26E-03 2.37E-05 1.0043 2.7005 RCP SEAL 48OGPM DGGFR1GEN 08218-8 L.24E-O2 2,09E-02 2.35E-05 L.O2L4 2.6693 DG 1B-B FAILS TO RUN FNSFR1FAN 030451 2.55E-03 4.44E-03 2.32E-05 1.0045 2.6508 EXHAUST FAN 1-FAN-30-461 FAILS TO RUN PMAF11PMP OO3OO118 1.08E-03 1.80E-03 2.31E-05 1.0018 2.6589 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1-3-118-A FANFR1FAN 030493 2.59E-04 4.05E-04 2.L7E-Os 1.0004 2,5623 DG 1B-B ROOM ELEC PANEL I COMBUSTTON AtR FAN (WBN-l-FAN-30-493)

FNSFDzFAN 030452 4.80E-03 7.49E-03 2.L7E-05 1.0075 2.5532 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR DGGFD2GEN 08228-8 7.15E-03 L,L2E-02 2.18E-05 1.0113 2.5528 DIESEL GENERATOR FAIIs TO START AND RUN FIRST HOUR (WBN-2-GEN -082-00028 -B)

SEQFD2B.B 3.33E-03 5.19E-03 2.t7E-05 1.0052 2.552L SEQUENCER 2B-B FAILS (Unknown UNID)

CBKFO2 B KR_2 1 11828 I L$-B 2.55E-03 3.95E-03 2.15E-05 1.004 2.5504 5.9KV SDBD BREAKER 1828 FAILS TO OPEN FNSFR2FAN 030452 2.55E-03 4.13E-03 2.16E-05 1.0041 2.545L EXHAUST FAN 2.FAN-30-462 FAII-S TO RUN DGGFR2GEN 0822B-B L.24E-02 1.93E-02 2.L7E-05 L.OL97 2.542 DG 2B-B FAlLS FAILS TO RUN (WBN-2-GEN -082-00028 -B)

DAOFO2FCO 030445 1.02E-03 1.57E-03 2.14E-05 1.0015 2.5372 SUPPLY DAMPER 2-FCO-30-4/i6 OPENS DAOFO2FCO 030462 1.02E-03 1.57E-03 2.14E-05 1.0015 2.5372 EXHAUST FAN DAMPER 2-FCO-30-462 FAILS TO OPEN DGGFR PFP 2.28E-03 3.45E-03 2.11E-05 1.0035 2.5L43 Diesel Generator fails to run after first hour

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 197

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit I Bas,ic Event CDF Impoilance RAW > 2 Event ProbabiliW R/

BB RRW RAW Deecription PMAF11PMP OO3OO128 1.08E-03 1.54E-03 2.10E-05 1.0015 2.5105 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN -L-3.L28-B FANFR2FAN 030494 2.59E-04 3.87E-O4 2.08E-05 1.0004 2.4933 DG 2B-B ROOM ELEC PANEL I COMBUSTTON AtR FAN (WBN FAN-30-4941 cBKXOIBKR_2 L2BL/88-B 4.10E-06 5.88E-05 1.99E-05 L

2.4339 48OV SDBD SUPPLY TO RMOV BOARD 1B1-B (1-BKR -2L2-BLI8B-B) cB KXO 1 B KR_z L3BL/ LA1-B 4.10E-06 5.88E-06 1.99E-05 1

2.4339 48OV RMOV BOARD NORMAL SUPPLY BREAKER TRANSFERS OPEN PMAFR1PMP OO3OO11.8 1.28E-04 L.77E-04 L.92E-05 1.0002 2.3825 PUMP FAILS AFTER 1 HOUR WBN-1-3-118-A RCPSEAL1S2 2.08E-01 3.54E-01 2.37E-05 L.5475 2.35L2 RCP SEAL L82 GPM MOCFO1FCV 001000s1 1.86E-04 2.45E-04 1.83E-05 1.0002 2.3189 Motor operated valve fails to open (clean water)

AOCFOTPCV 00300122 8.83E-05 1.15E-04 1.83E-05 1.0001 2.3135 AIR OPERATED VALVE FAILS TO OPEN (clean water) WBN-1 L22 HEXPL2HTX O82O72OB1-B 1.55E-05 2.01E-05 1.81E-05 L

2.2996 HEAT EXCHANGER zBL PLUGS HEXPL2HTX O82O72OB2-B 1.55E-05 2.01E-05 1.81E-05 L

2.2996 HEAT EXCHANGER 282 PLUGS PMAFR1PMP OO3OO128 1.28E-04 1.64E-04 1.79E-05 1.0002

?.2832 PUMP FAILS AFTER 1 HOUR WBN.1-3-128.B AOCFO1PCV 00300132 8.83E-05 1.08E-04 1.70E-05 1.0001 2.2246 AIR OPERATED VALVE FAILS TO OPEN (clean water) WBN-1 L32 HEXRPzHTX O82O72OB1-B 5.57E-06 5.74E-05 1.68E-05 L

2.2A97 HEAT EXCHANGER zBL RUPTURES HEXRP2HTX A82O72OB2-B 5.57E-06 6.74E-O6 1.58E-05 L

2.2097 HEAT EXCHANGER 282 RUPTURES CKRRIOCKV O67O5O3BIE 2.59E-O4 3.L2E-04 1.57E-05 1.0003 2.20L2 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-O 5038 CKRRIOCKV O57O5O3D!E 2.59E-04 3.L2E-04 1.67E-05 1.0003 2.20L2 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-O 503D HEXPL1HTX O82O72OB1-B 1.55E-05 1.85E-05 1.65E-05 L

2.L937 HEAT EXCHANGER 1B1 PLUGS HEXPL1HTX O82O72OB2-B 1.55E-05 1.85E-05 1.66E-05 L

2.L937 HEAT EXCHANGER LB? PLUGS cBKXOoBKR_236413O4-G 4.10E-06 4.83E-06 1.54E-05 L

2.L764 NORMAL 125V DC SUPPLY BREAKER TRANSFERS OPEN FUSFPoFU_23 64130L-G 3.12E-06 3.63E-06 1.52E-05 1

2.L64 125VDC SUppLy FUSE O-236-41F301-G FNSFR1FAN O3OOO214 2.66E-03 3.02E-03 1.58E-05 1.003 2.L3L7 DC EMERGENCY EXHAUST FAN FAILS TO RUN AFTER 1ST HOUR wBN-L-30-2L4 SWPFDlPS OO3O138A L.L7E-04 L.25E-04 1.50E-05 1.0001 2.0803 PRESSU RE SWITCH WBN-1-PS.3-138A FA! LS

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 198

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 75 -- Unit t Basic Event CDF lmportance RAW > 2 Event Pnobability FV BB RRW RAW Description MORXCZFC.{ 05767 9.77E-O7 1.01E-05 L.43E-05 1

2.0296 2-FCV-57-67 MOV TRANSFERS CLOSED CRI 1.20E-05 8.51E-03 9.39E-02 1.0086 6754.294 CONTROL RODS FAIL TO INSERT SMPPS1STN SUMPz 1.00E-05 2.25E-03 3.13E-03 1.0023 225.8325 SUMP SUCTION STRAINERS PLUGGED (GENERAL)

BUSFRlBD 211A-A 1.04E-05 2.10E-03 2.80E-03 1.0021 202.3086 WBN-1-BD-211.A SHUTDOWN BOARD FAILS CKRRIOCKV O57O5O3B 7.L0E-07 8.05E-05 1.58E-03 1.0001 LL4.2776 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-O 503B cKRRtocKV 0570503D 7.LOE-O7 8.05E-05 1.58E-03 1.0001 LL4.2776 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN.O s03D XRFFR1OXF zLzAL-A 2.L7E-05 2.25E-03 1.45E-03 1.0023 105.3155 6.9kV TO 480V TRANSFORMER 1A1-A (XFMR 1A1-A)

BUSFR1BD zLzAL-A 1.04E-05 1.08E-03 1.45E-03 1.0011 104.9939 480V SHUTDOWN BOARD 1A1-A BUS AVAILABLE (WBN-I-BD -

2L2-A001 -A)

CBKXO1BKR zLzAL-A 4.10E-05 4.25E-04 1.44E-03 1.0004 104.5635 6.9kV SUPPLY TO TRANSFORMER 1A-A (I-BKR-2L2-A1-A)

TRANSFERS OPEN CBKXOIBKR 2L2AL/18-A 4.10E-05 4.25E-04 L.44E-03 1.0004 104.5635 TRANSFORMER OUTPUT TO 480V SDBD 1A1-A (1-BKR-212-AL/ LB-A) TRANSFERS O P EN Note: this table does not include CCF, HEPs, or T&M

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 199

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 76 -- Unit 2 Basic Event CDF Importance F-V >0.570 Euent Probability FlT BB RRW RAW Deecription PAF 9.14E-01 1.00E+00 1.55E-05 1E+30 1.0941 PLANT AVAI LABI LITY FACTOR RCPSEALLSZ 2.08E-01 3.56E-01 2.52E-05 L.576 2.3959 RCP SEAL L82 GPM FL-BATDEP 1.00E+00 5.46E-02 7.80E-07 L.0577 L

Battery Depleted FLAG FL-ATWS 1.00E+00 3.85E-02 5.50E-07 1.04 1

ATWS PTSF12PMP OO3OO1AS 1.05E-02 3.40E-02 4.65E-05 1.0352 4.2L92 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1-3.1.AS DGGFR2GEN 0822A-A L.24E-02 3.20E-02 3.70E-05 1.0331 3.5548 DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR xsBo14 4.59E-42 2.88E-02 8.95E-06 1.0295 L,5977 Recovery Sequence 7 (Common Cause of DG to Start) GR SUMMER 2.00E-01 2.87E-02 2.05E-05 1.0295 L.LL49 SUMMER SEASON xsBo13 5.50E-02 2,82E-02 7.19E-05 L.029 L.4754 Recovery Sequence 7 (Common Cause of DG to Start) PC U2 OBLOCK 7.50E-01 2.69E-02 5.13E-07 L.0277 1.009 Probability that 0 PORVs are blocked DGGFR2GEN 0822B-B L.24E-02 2.45E-02 2.83E-05 L.0252 2.9573 DG 2B-B FAlLS FATLS TO RUN (WBN-2-GEN -082-00028 -B)

MORFO2FCV 05700055 9.70E-04 2.26E-02 3.33E-04 L.O23L 24.2843 Added for evaluation WBN-2-10-135 and WBN-2-11-0006 DGGFD2GEN 0822A-A 7.15E-03 2.05E-02 4.09E-05 1.0209 3.8437 DIESEL GENERATOR 2A-A FAILS TO START AND RUN FIRST HOUR DGGFR1GEN 08218-8 L.24E-02 2.00E-02 2.31E-05 L.4204 2.594 DG 1B-B FAILS TO RUN xsBo15 1.37E-01 L.72E-02 1.80E-06 L.OL75 1.1085 Recovery Sequence 7 (Common Cause of DG to Start) Wl MORFOT.FCV 06700057 9.70E-04 1.58E-02 2.47E-04 t.0L7 18.2519 Added for evaluation WBN-2-10-135 and WBN-2-11-0006 DGGFD2GEN O8228-B 7.15E-03 1.51E-02 3.23E-05 1.0154 3.2425 DIESEL GENERATOR FAILS TO START AND RUN FIRST HOUR (WBN-2-GEN -082-00028 -B)

FNSFRzFAN O3OOO183 2.65E-03 1.48E-02 7.91E-05 1.015 6.5244 CCP A ROOM COOLER FAN FAILS DURING OPERATION POEFROPMP O67OOO28IE 5.12E-02 L,4LE-O2 3.93E-06 1.0143 L.2607 ERCW PUMP A-A FAILS TO RUNINITIATING EVENT WBN-O-G7.

28 POEFROPMP O67OOO35IE 5.L2E-02 L.4LE-02 3.92E-05 1.0143 L.2603 ERCW PUMP C-A FAILS TO RUN INITIATING EVENT WBN-O-G7-35 FNSFDzFAN O3O45O 4.80E-03 L.37E-Oa 4.08E-05 1.0139 3.8458 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR RLVFO2RFV 0620635 2.47E-03 L.37E-02 7.89E-05 1.0138 6.5t27 WBN-1-RFV-062.0636-S RELIEF VALVE FAILS TO OPEN PRA!2 1.70E-01 1.36E-02 1.14E-05 1.0138 1.0654 lnterval 2 for PRA (pres relief requires 3 SVs & 2 PORVs)

I subject WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 76 -- Unal 2 Basic Event GDF lmpoftance F-V >0.5olo Event Prcbability Ft/

BB RRW RAW Description xsBo11 5.52E-01 L.32E-02 2.85E-07 1.0134 L.0067 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) GR MORFOzFCV 05700057 9.70E-04 L.25E-02 1.85E-04 1.0128 13.9992 Added for evaluation WBN-2-10-135 and WBN-2-11-0005 cRr 1.20E-05 t.L7E-Oz 1.30E-01 1.0119 9LzL.3LL CONTROL RODS FAIL TO INSERT DGGFD1GEN 0821B-B 7.15E-03 1.16E-02 2.31E-05 L.OLL7 2.5048 DG 1B.B FAILS TO START AND RUN FIRST HOUR xsBo10 7.06E-01 1.13E-02 2.29E-O7 1.0114 L.OO47 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) PC FNSFD2FAN 030452 4.80E-03 1.08E-02 3.22E-05 1.0109 3.24L7 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR PRAI3 1.50E-01 1.03E-02 9.78E-07 1.0104 1.0582 lnterval 3 for PRA (pres relief requires 3 SVs & 1 PORV)

SEQFD2A-A 3.33E-03 9.50E-03 4.09E-05 1.0096 3.8446 SEQUENCER 2A-A FAILS (Unknown UNID) xsBo17 5.52E-01 8.44E-03 t.82E-07 1.0085 1.0043 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) GR FNSFD1FAN 030461 4.80E-03 7.75E-03 2.31E-05 1.0078 2.6059 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR PTSFR2PMP OO3OO1AS 1.61E-03 7.74E-03 5.85E-05 1.0078 5.7842 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS DGGFD FP 5.45E-03 7.57E-O3 1.98E-05 L.0076 2.378 Diesel Generator fails to start or during first hour of operation SEqFD2B-B 3.33E-03 7.48E-03 3.21E-05 1.0075 3.2378 SEQUENCER 2B-B FAILS (Unknown UNID)

DGGFR1GEN 0821A-A L.24E-02 7.35E-03 8.48E-06 L.AO74 1.5853 DG 1A-A FAILS TO RUN cB KFO2 B KR_2L L1815 l L6-A 2.55E-03 7.33E-03 4.11E-05 L.0074 3.8554 6.9KV SDBD BREAKER 1816 FAILS TO OPEN Ul 2sOBATTDEP 1.00E+00 7.26E-03 1,.04E-07 1.0073 1

Unit 1250V Battery Life Depleted xsBo15 7.06E-01 7.23E-03 L.46E-07 1.0073 1.003 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) PC FL SPARE 250 CHGR NOT A 1.00E+00 7.20E-03 1.03E-O7 1.0073 1

SPARE CHARGER NOT ALIGNED FOR A TRAIN XPORVl 5.29E-02 7.L9E-03 1.94E-05 L.OO72 L.t287 BLOCK VALVE CLOSED TO ISOLATE LEAKING PORV FNSFRzFAN 030460 2.65E-03 5.84E-03 3.57E-05 1.0059 3.5607 EXHAUST FAN 2-FAN-30-450 FAILS TO RUN BUSFROBD 2364G !E 3.80E-03 6.71E-03 2.52E-05 1.0069 2.7586 125V DC VITAL BATTERY BOARD IV FAILS DURING OPERATION MCRI 1.00E-01 6.20E-03 8.85E-07 1.0052 1.0558 CONTROL ROD INSERTION FAILS PR-INS 1.00E+00 5.81E-03 8.30E-08 1.0058 1

lnsufficient pressure relief

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 201

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 76 - Unit t Basi* Eyent CDF lmportance F-\\I >0.596 Euent Probability R'

SB fiRW RAW Description cB KFO2 B KR_2 1 1 1828 I L6-B 2.55E-03 5.80E-03 3.25E-05 1.0058 3.2682 5.9KV SDBD BREAKER 1828 FAILS TO OPEN SEQFDlB-B 3.33E-03 5.35E-03 2.30E-05 1.0054 2.5053 SEQUENCER 1B-B FAILS (Unknown UNID)

FNSFR2FAN 030452 2.66E-03 5.21E-03 2.79E-05 1.0052 2.9489 EXHAUST FAN 2-FAN-3O-462 FAILS TO RUN SRVSR2SRV 06800563 7.95E-04 5.05E-03 9.08E-05 1.0051 7.3522 SAFEW VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN.2.

58-s63 SRVSR2SRV 05800554 7.95E-04 5.05E-03 9.08E-05 1.0051 7.3522 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN 68-564 SRVSRzSRV 06800565 7.95E-04 5.05E-03 9.08E-05 1.0051 7,3522 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN 58-s5s Note: this table does not include CCF, HEPs, or T&M

lvs,vv,urrv,,,!v,rr.-

rvr l

l l

Y I

I Suoject: WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I TablE'77 -- l"fxlit 2 Basic Event GDF lmpor,tance RAUII > 2 Event Prcbability R'

BB RRt['

,ffi1fif Descriptlon cRr 1.20E-05 t.L7E-02 1.30E-01 1.0119 9Lzl,.3LL CONTROL RODS FAIL TO INSERT SMPPS2STN SUMP2 1.00E-05 2.L9E-03 3.13E-03 L.OO22 2L9.947L SUMP SUCTION STRAINERS PLUGGED (GENERAL)

BUSFRzBD 211A-A 1.04E-05 1.34E-03 1.83E-03 1.0013 129.3839 SHUTDOWN BOARD 2A-A FAlLs (2-BD-211-A-A) cKRRtocKV 0570503D 7.LOE-O7 5.95E-05 1.40E-03 1.0001 98.8854 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-o.

67-s03D XRFFR2OXF 2L2A2-A 2.L7E-Os 1.92E-03 1.25E-03 1.0019 89.409 5.9kV/480V TRANSFORM E R 2A2A (z-OXF-2L2-A002-A)

BUSFR2BD 2L2A2-A 1.04E-05 9.19E-04 1.26E-03 1.0009 89,L77 48OV SHUTDOWN BOARD 2A2-A BUS FAILS TO OPERATE CBKXO2BKR 2L2A2-A 4.10E-05 3.60E-04 L.25E-03 1.0004 88.7643 5.9KV SUPPLY TO 2A2A (2-BKR -2L2-A2-A) TRANS FERS O P EN CBKXO2BKR_2 L2A2lrB-A 4.10E-06 3.50E-04 L.25E-03 1.0004 88.7643 48OV SDBD 2A2-A SUPPLY BREAKER (2-B KR -2L2-A2l LB-A) TRAN S FE RS O P E N HORXO1SV 0670505A 3.19E-08 2.75E-05 L.23E-03 1

87.L234 MANUAL VALVE WBN-1-57-505A TRANSFERS OPEN (FLOW DTvERSTON)

BUSFROBDL 2363-F 8.58E-05 3.50E-04 5.92E-04 1.0004 42.4L63 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MrssroN TrME (20 HoURS)

BUSFROBD 2353-F L.74E-O6 5.88E-05 5.56E-04 1.0001 40.6191 Failure of 125V DC Battery Board 3 BCH FROCH RG2353-F L.22E-O4 4.L7E-03 4.89E-04 L.0042 35.2292 CHARGER III FAILS DURING OPERATION (0-cH RG-235-0003/F) cBKXOoBKR_23631226-F 4.10E-05 1.35E-04 4.69E-04 1.0001 33.855 Normal Supply Breaker 226 from 125V Vital Batt Chgr 3 cBKXO0SW_2363/SW1-S 4.10E-06 1.35E-04 4.69E-04 1.0001 33.856 480V AC Vital Disconnect Panel lll Switch 0-SW-235-0003/SW1-S Transfers Open FUSFP0FU_23 63(aLO-F 3.12E-06 1.02E-04 4.58E-04 1.0001 33.7385 SUPPLY BREAKER MAIN LINE FUSE zLO BUSFROBDL 2364-G 8.68E-05 2.59E-04 4.26E-O4 1.0003 30.8283 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MtssroN TIME (20 HouRs)

BUSFR2BD 211B-B 1.04E-05 2.88E-04 3.95E-04 1.0003 28.6616 WBN-2-BD.211-B-B SWITCHBOARD FAILS DURING OPERATION CCF U2 ESF 15V FO ALL 4.94E-O7 1.36E-05 3.92E-04 1

28.4328 COMMON CAUSE 15VDC BETWEEN BUS L,2,3 AND 4 BOTH TRAIN A AND B

l CrJ.rl"ti". l l"Jt/lDN-000-999-2008-0 t--'--"-""-""-'-'tlt-l I

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I Table 77 -- Unit 2 Basic Event CDF Importance RAW > 2 Event Probability FV BB RRW RAW Description BUSFROBD 2364-G L.74E-06 4.58E-05 3.85E-04 L

27.9557 Failure of 125V DC Battery Boa rd 4 MORFOzFCV 05700055 9.70E-04 2.25E-02 3.33E-04 L.O23!

24.2843 Added for evaluation WBN-2-10-135 and WBN-2-11-0005 XRFFR2OXF zLzAL-A 2.L7E-O5 4.60E-04 3.03E-04 1.0005 22.L869 6.9kV TO 480V TRANSFORMER 1A1-A(XFMR 2A1-A)

BUSFR2BD zLaAL-A 1.04E-05 2,L7E-04 2.98E-04 1.0002 2L.8764 48OV SHUTDOWN BOARD 2A1.-A FAILS TO OPERATE CBKXO2BKR zLzAL-A 4.10E-06 8.38E-05 2.9LE-O4 1.0001 2L.4045 5.9KV SUPPLY TO TRANSFORMER 2A1A (2-BKR -2L2-A1-A)

CBKXO2BKR_z LaAL/LB-A 4.10E-06 8.38E-05 2.9LE-04 1.0001 2L.4045 480V SDBD 2A1-A SUppLy BREAKER TRANSFERS OPEN (WBN-2-BKR -2L2-A001/18 -A)

TKU RP2TAN KO53OOO46 5.35E-08 1.09E-05 2.9LE-04 L

2L.3749 WBN-z-TAN K-053.046 RWST TAN K RU PTU RE BUSFRzMCC ZL4AL-A 1.04E-05 2.04E-04 2.80E-04 1.0002 20.5139 48OVAC CONT & AUX BLDG VENT BOARD 2-MCC-2L4-AOO1-A (2A1-A) FAtls TO RUN c B KXO2 B KR_2 LaALI L0 B-A 4.10E-06 7.86E-05 2.74E-04 1.0001 20.L494 48OV SDBD FDR BKR TO C&A BLD VENT BOARD 2A1-A (2-BKR -2L2-A1l10B-A) c B KXO2 B KR_2 L4ALI LAI-A 4.10E-06 7.86E-05 2.74E-04 1.0001 20.L494 S U P P LY B REAKE R 2-B KR -aL4-AOOL/ 2A1-A TRANS F E RS O P E N RTBFO2RTB O99OOOOA 3.70E-05 6.91E-04 2.67E-04 1.0007 L9.6675 WBN-2-BKR-099-1116/LB-A REACTOR TRIP BREAKER TRAIN A FAILS RTBFOzRTB O99OOOOB 3.70E-05 6.50E-04 2.55E-04 1.0007 18.8392 WBN-2.BKR-099-1116/LC-B REACTOR TR!P BREAKER TRAIN B FAILS MORFO1FCV 05700067 9.70E-04 1.58E-02 2.47E-04 L.0t7 18.2519 Added for evaluation WBN-2-10-L35 and WBN-2-11-0005 BUSFR1BD ZLLB-B 1.04E-05 L.76E-04 2.4LE-04 1.0002 17.8965 SHUTDOWN BOARD 1B-B FATLS (1-BD-211-B-B)

MORFO2FCV 06700067 9.70E-04 L.26E-02 1.86E-04 1.0128 13.9992 Added for evaluation WBN-2-10-135 and WBN-2-11-0005 XRFFR2OXF 2L2B2-B 2.t7E-O5 2.30E-04 1.51E-04 1.0002 11.603 TRANS FO R M E R W B N -z-OX F -2L2 B FAI LS TO O P E RATE BUSFR2BD 2L282-B 1.04E-05 1.07E-04 L.47E-04 1.0001 11.3076 48OV SHUTDOWN BOARD 282-8 BUS FAILURE BCH FROCH RG2354-G L.22E-04 1.17E-03 L.37E-04 1.0012 10.598 wBN-0-cHRG-236-0004/c CHARGER FATLS DURTNG OPERATION CBIO(O2BKR 2L282-B 4.10E-06 3.93E-05 L.37E-O4 L

10.5685

5. 9 KV B R EA K E R W B N.2-B K R -2L2 B TRA N S F E RS O P E N cBKXO2BKR_z LaBZ(LB-B 4.10E-06 3.93E-05 L.37E-04 1

10.5585 WBN-2-BKR-2 L2-82/18-B BREAKER TRANSFERS OPEN BUSFR2BD 2353-F 1.04E-05 9.52E-05 1.31E-04 1.0001 10.143 12OV AC VITAL INST POWER BOARD 2-III FAILS HXRPL2HTX 07000185 1.55E-05 1.39E-04 L.29E-04 1.0001 9.9984 WBN-2-HTX-O7O-0185 CCS HEAT EXCHANGER B PLUGGING

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:204

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event CDF lmportance RAW > 2 Event Probability R'

BB RRW RAW Description HXCRP2HTX 07000185 5.57E-05 4.80E-05 L.23E-04 1

9.5155 WBN-2.HTX-O7O-0185 CCS HEAT EXCHANGER B EXCESSIVE LEAKAGE/RUPTURE RLVPO2RFV O7OOO521 5.09E-05 4.36E-05 L.22E-04 1

9.5503 2-70-521 RELIEF VALVE OPENS PREMATURELY (WASTE GAS CoMPRESSOR HX)

RLVPO2RFV 07000658 5.09E-06 4.35E-05 L.22E-04 L

9.5603 2-70-668 RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO2RFV O7OOO594 5.09E-06 4.36E-05 L.22E-04 L

9.5503 2-70-694 RELTEF VALVE OPENS PREMATURELY (RCp OIL cooLER)

RLVPO2RFV O7OOO7O3 5.09E-06 4.35E-05 L.22E-44 L

9.5603 2-RFV-70-7O3 RELTEF VALVE OPENS PREMATURELY (EXCESS LETDOWN HX)

RLVPO2RFV O7OOO74L 5.09E-06 4.36E-05 L.22E-04 L

9.5603 2-70-741 RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO2RFV O7OO551A 5.09E-06 4.36E-05 L.22E-04 L

9.5503 2.70-551A RELIEF VALVE OPENS PREMATURELY RLVPO2RFV 0700556A 5.09E-06 4.35E-05 t.22E-O4 L

9.5503 2-70-556A RELIEF VALVE OPENS PREMATURELY RLVPO2RFV 0700561A 5.09E-05 4.35E-05 L.22E-O4 1

9.5503 2-70-561A RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO555A 5.09E-06 4.36E-05 L.22E-04 L

9.5503 2-70-565A RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO57OA 5.09E-05 4.35E-05 L.22E-O4 1

9.5603 2-70-570A RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO578 5.09E-06 4.35E-05 L.22E-04 1

9.5603 2-RFV-70-578 RELTEF VALVE OPENS PREMATURELY (NON-REGEN HX)

RLVPOzRFV O7OO584 5.09E-05 4.36E-05 L.22E-04 1

9.5603 2-RFV-70-584 RELTEF VALVE OPENS PREMATURELY (SEAL WATER HX)

RLVPO2RFV O7OO583A 5.09E-05 4.36E-05 L.22E-04 L

9.5603 2-RFV-70-583A RELIEF VALVE OPENS PREMATURELY (THERMAL BARRIER)

RLVPOzRFV O7OO583B 5.09E-05 4.35E-05 L.22E-O4 1

9.5503 2-RFV-70-583B RELIEF VALVE OPENS PREMATURELY (THERMAL BARR!ER)

RLVPOzRFV O7OO583C 5.09E-05 4.35E-05 L.22E-04 1

9.5503 2-RFV-70.683C RELIEF VALVE OPENS PREMATURELY (THERMAL BARRIER)

RLVPO2RFV O7OO583D 5.09E-06 4.35E-05 L.22E-O4 L

9.5503 2-RFV-70-683D RELIEF VALVE OPENS PREMATURELY (THERMAL BARRIER)

RLVPO2RFV O7OO729A 5.09E-06 4.36E-05 L.22E-04 1

9.5603 2-70-729A RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

RLVPO2RFV O7OO729B 5.09E-05 4.36E-05 L.22E-04 1

9.5503 2-70-7298 RELTEF VALVE OPENS PREMATURELY (SAMPLE HX)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:205

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit f Basic Event CDF lmpoilance RAW > 2 Event Probability R'

sB, RRW RAW Descrifiion XRFFR2OXF 2L2B1-B 2.L7E-05 1.84E-04 L.2LE-04 1.0002 9.4708 WBN-2.OXF-212.B1-B TRANSFORMER FAILS DURI NG OPERATION cBKXO2SW 23s3-F 4.10E-05 3.47E-05 L.2LE-O4 L

9.4y'.25 Disconnect Switch in 120V AC Vital lnst Power Board 2-lll CBKXO2XSW 2353-F 4.10E-05 3.47E-05 L.2LE-04 1

9.M25 Transfer Switch in 120V AC Vital lnst Power Board 2-lll cBKXOoBKR_23641226-G 4.10E-05 3.45E-05 1.20E-04 1

9.4004 Normal Supply Breaker 226 from 125V Vital Batt Chgr 4 cBKXO0SW_2364/SW1-S 4.10E-06 3.45E-05 1.20E-04 L

9.4004 wBN-0-sw-23 5-0oo4lsw1-s swtrcH TRANSFERS OPEN FUSFPoFU_23 64(2LO-G 3.12E-05 2.55E-05 L.L7E-O4 1

9.L778 SUPPLY BREAKER MAIN LINE FUSE zLO BUSFR2BD zLzBL-B 1.04E-05 7.97E-05 1.09E-04 1.0001 8.5464 48OV AC SHUTDOWN BOARD 281-8 BUS FAILURE MORXC2FCV 06700143 9.77E-O7 7.35E-05 1.07E-04 L

8.5246 WBN-2.FCV-067 -0L43-A VALVE TRANSFERS CLOSED SMPPL2STN SUMP1 2.15E-06 1.60E-05 1.05E-04 1

8.3858 suMp sugfloN STRATNERS PLUGGED (LLOCA OR MLOCA)

PCOFR1PMP 07000515 8.67E-05 6.09E-04 1.00E-04 1.0005 8.0226 WBN.O.PMP-O7O-OO51.S PUMP CS FAILS TO OPERATE PCOFR2PMP 0700059 8.67E-05 5.02E-04 9.93E-05 1.0005 7.9502 WBN-2-PMP-O7O-0059 PUMP 2A-A FAILS TO OPERATE CBKXOzBKR ZLaBL-B 4.10E-06 2.81E-05 9.78E-05 L

7.8427 5.9 KV B R EAK E R W B N B K R -ZL}-BL-B TRAN S FE RS O P E N cBKXO2BKR_2 LaBLILB-B 4.10E-06 2.81E-05 9.78E-05 1

7.8427 48OV BREAKER 2-BKR-2L2-BL-1B TRANSFERS OPEN HXRPLoHTX 07000186 1.55E-05 1.01E-04 9.33E-05 1.0001 7.5293 WBN.O.HTX-O7O-0186 CCS HEAT EXCHANGER C PLUGGING cKcFo2cKV 06300585 1.30E-05 8.47E-05 9.31E-05 1.0001 7.5L7 WBN-2-CKV-053-0585-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 06300587 1.30E-05 8.47E-05 9.31E-05 1.0001 7.5L7 WBN.2.CKV-053-0587-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFozcKV 06300588 1.30E-05 8.47E-05 9.31E-05 1.0001 7.5L7 WBN-2-CKV-053-0588-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFozcKV 05300s89 1.30E-05 8.47E-05 9.31E-05 1.0001 7.5L7 WBN-2-CKV-063-0589-S CHECK VALVE FAILS TO OPEN ON DEMAND SRVSR2SRV 05800553 7.95E-O4 5.05E-03 9.08E-05 1.0051 7,3522 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN.2-58-s53 SRVSR2SRV 06800554 7.95E-04 5.05E-03 9.08E-05 1.0051 7.3522 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN 58-554 SRVSR2SRV 0580055s 7.95E-04 5.05E-03 9.08E-05 1.0051 7.3522 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF WBN 68-s6s CBKXOBKR_23 631304-F 4.10E-06 2.53E-05 8.80E-05 1

7.L573 125V DC SUPPLY BREAKER TRANSFERS OPEN

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 206

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event GDF lmpoilance RAW > 2 Event Probability FU BB RRUI' RAW Description FUSFP0FU 23 63130L-F 3.12E-06 1.88E-05 8.62E-05 L

7.0326 125VDC SUPPLY FUSE 0-235-3 l30L-F HOO(CzFCV 07000015 7.49E-08 4.47E-O7 8.52E-05 1

5.954 WBN-2-FCV-070-0015-A TRANSFERS CLOSED (LOCKED OPEN wrTH POWER REMOVED)

HOCXC2FCV 07000015 7.49E-O8 4.47E-07 8.52E-05 L

5.954 WBN-2-FCV-070-0015-A TRANSFERS CLOSED (LOCKED OPEN wrTH POWER REMOVED)

HOCXC2TSV 07000510 7.49E-08 4.47E-07 8.52E-05 1

6.964 WBN.2.ISV-O7O-0510-A VALVE TRANSFERS CLOSED HOCXC2TSV 0700544A 7.49E-08 4.47E-07 8.52E-05 1

5.954 WBN-2-!SV-O7O-0544A-S VALVE TRANSFERS CLOSED HOCXC2TSV 0700s44C 7.49E-O8 4.47E-07 8.52E-05 L

5.964 WBN-2-ISV-O7O-0544C-A VALVE TRANSFERS CLOSED HORXC2TSV 05700545 7.49E-O8 4.47E-07 8.52E-05 L

6.964 2-057-0545 VALVE TRANSFERS CLOSED HORXC2TSV 05701009 7.49E-08 4.47E-O7 8.52E-05 L

5.964 WBN-2-ISV-057-1009 VALVE TRANSFERS CLOSED HORXCzTSV 05701010 7.49E-08 4,47E-07 8.52E-05 L

5.954 WBN-2.ISV-057-1010 VALVE TRANSFERS CLOSED BUSFRzMCC ZL4BL-B 1.04E-05 5.19E-05 8.48E-05 1.0001 6.9384 48OVAC CONT & AUX BLDG VENT BOARD 2.MCC-2L4-BOO1-B (281-8) FAILS TO RUN HXCRPoHTX 07000185 5.57E-05 3.09E-05 7.94E-05 1

5.5555 WBN.O-HTX-O7O-0185 CCS HEAT EXCHANGER C EXCESSIVE LEAKAGE/NUPTURE FNSFRzFAN O3OOO183 2.65E-03 1.48E-02 7.91E-05 1.015 6.5244 CCP A ROOM COOLER FAN FAILS DURING OPERATION RLVFO2RFV 0620636 2.47E-03 L.37E-02 7.89E-05 1.0138 6.5L27 WBN-1-RFV-052-0636-S RELIEF VALVE FAILS TO OPEN RLVPO1RFV O7OO551B 5.09E-05 2.80E-05 7.85E-05 1

6.4992 1-70-5518 RELIEF VALVE OPENS PREMATURELY RLVPO1RFV O7OO555B 5.09E-05 2.80E-05 7.86E-05 L

6.4992 1-70-5568 RELIEF VALVE OPENS PREMATURELY RLVPO1RFV 07005618 5.09E-05 2.80E-05 7.85E-05 L

6.4992 1-70-5618 RELIEF VALVE OPENS PREMATURELY RLVPO1RFV 07005658 5.09E-05 2.80E-05 7.85E-05 1

6.4992 1-70.5658 RELIEF VALVE OPENS PREMATURELY RLVPOTRFV O7OO57OB 5.09E-06 2.80E-05 7.86E-05 1

6.4992 L-70-5708 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO551B 5.09E-06 2.80E-05 7.86E-05 1

6,4992 2.70-5518 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO555B 5.09E-05 2.80E-05 7.86E-05 1

6.4992 2-70-5568 RELIEF VALVE OPENS PREMATURELY RLVPOzRFV O7OO551B 5.09E-05 2.80E-05 7.85E-05 1

6.4992 2-70-5618 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO555B 5.09E-06 2.80E-05 7.86E-05 L

6.4992 2-70-5558 RELIEF VALVE OPENS PREMATURELY RLVPO2RFV O7OO57OB 5.09E-06 2.80E-05 7.85E-05 1

6.4992 2-70.5708 RELIEF VALVE OPENS PREMATURELY HORXC1FCV 06700022 7.49E-08 4,L0E-07 7.81E-05 1

6.4702 ERCW 1A SUPPLY HDR MOV WBN-1-FCV-57-22 TRANSFERS cLosED (LO/PR)

HORXC1FCV 06700081 7.49E-08 4.LOE-O7 7.81E-05 1

6.4702 rocKED opEN WBN-1-FCV-67 -SLTRANSFERS CLOSED (LOlpR)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:207

Subject:

WBN PROBABILISTIG RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event CDF lmpoilance RAW > 2 Event Prohebility FV BB RRW Rtw Description HORXC1FCV 06700127 7.49E-09 4.LOE-O7 7.81E-05 1

6.4702 WBN-1-FCV-o 67 -0L27 TRANSFE RS CLOSED ( LO/PR)

HORXCIrSV 0570505A 7.49E-08 4.10E-07 7.81E-05 L

6.4702 MANUAL VALVE WBN-1-67-505A TRANSFERS CLOSED AOCXO2FCV 06200s3 5.09E-04 3.27E-03 7.55E-05 1.0033 6.3595 WBN-2-FCV -062.0053 FCV TRANSFERS OPEN SIPHONING FLOW FROM SEALS cB KXO 2 B KR_2 LZBLI L0 B-B 4.10E-06 2.18E-05 7.50E-05 t

5.3178 48OV SDBD FDR BKR TO C&A BLD VENT BOARD 281-8 (2-BKR -ZL2-BLI108-B) cB KXOz B KR_2 L4BL/ LA 1-B 4.10E-06 2.18E-05 7.50E-05 1

5.3178 su PPLY BREAKER 2-BKR -2L4-A001/1A1-B TRANSFERS OPEN PCCFR2PMP O52O1O8A 8.79E-05 4.51E-04 7.49E-05 1.0005 6.24L2 WBN-I-PMP-062-0108-A CCP 1A-A FAILS DURING OPERATION HXCPL2HTX 03000183 1.55E-05 7.78E-05 7.18E-05 1.0001 6.0258 WBN-2-CLR -O3O-0183 CVCS CCP A ROOM COOLER HEAT EXCHANGER PLUGS HXCPL2HTX 0520108A 1.55E-05 7.78E-05 7.18E-05 1.0001 6.0268 CCP 2A-A LUBE OIL COOLER PLUGS HXCPLzHTX 05201088 1.55E-05 7.78E-05 7.18E-05 1.0001 5.0258 CCP 2A-A GEAR OIL COOLER PLUGS RLVSO2RFV 0520636 5.09E-06 2.53E-05 7.10E-05 L

5.9726 WBN-2-RFV-052-0536-S RELIEF VALVE TRANSFERS CLOSED AOCXC2FCV 0620009 4,37E-06 2.L7E-05 7.08E-05 1

5.9553 WBN-z-FCV -062-0009 AOV TRANSFERS CLOSED AOCXCZFCrl 0620022 4.37E-O6 2.L7E-05 7.08E-05 L

5.9553 WBN-z-FCV -052.0022 AOV TRANSFERS CLOSED AOCXC2FCV 0520035 4.37E-O6 2.L7E-05 7.08E-05 L

s.9s53 WBN-2.FCV -052-0035 AOV TRANSFERS CLOSED AOO(CzFCV 0520048 4.37E-06 2.L7E-05 7.08E-05 L

5.9553 WBN-2.FCV -062-0048 AOV TRANSFERS CLOSED AOCXC2FCV 0620093 4.37E-06 2.L7E-Os 7.08E-05 L

5.9563 WBN-2.FCV -062-0093 AOV TRANSFERS CLOSED FLTPL2FLTRO62OO9T 2.37E-06 1.15E-05 7.01E-05 1

5.9051 WBN-2.FLTR.O62-0097 SEAL WATER lNJECTION FILTER PLUGS HOCXC2TSV 0700503A 7.49E-08 3.55E-07 5.98E-05 L

5.8839 WBN-2.ISV-O7O-O5O3A-A PUMP 2A-A SUCTION VALVE TRANSFERS CLOSED HOCXC2TSV 0700505A 7.49E-08 3.56E-07 6.98E-05 1

5.8839 WBN.2-ISV-O7O-O5O5A-A PUMP 2A-A DISCHARGE VALVE TRANSFERS CLOSED HXCRPzHTX 03000183 5.57E-06 2.7LE-O5 5.96E-05 L

5.874/.

WBN-z-CLR -O3O-0183 CVCS CCP A ROOM COOLER HEAT EXCHANGER RUPTURES HXCRP2HTX 0520108A 5.57E-05 2.7LE-O' 5.96E-05 1

5.874/,

CCP 1A-A LUBE OIL COOLER RUPTURES HXCRP2HTX 06201088 5.57E-06 2.7LE-05 5.95E-05 L

5.874y',

CCP 1A-A GEAR OIL COOLER RUPTURES AORXCzFCV 06700168 4.37E-05 2.11E-05 5.91E-05 L

5.8374 AOV FCV-57-168 TRANSFERS CLOSED (LOCKED OPEN POWER REMOVED)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 208

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 - Unit 2 Basic Event GDF lmportanss ffiIflf > 2 Event Probability R'

BB RRW RAlfiT Description PTSFR2PMP OO3OO1AS 1.51E-03 7.70E-03 6.85E-05 1.0078 5.7842 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS cKcxc2cKv 0620560 4.94E-08 2.33E-07 6.74E-05 L

5.7L62 WBN-2-CKV-052-0550-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0520s61 4.94E-08 2.33E-O7 6.74E-05 1

5.7L62 WBN-2-CKV-052-0551-S CH ECK VALVE TRANSFERS CLOSED cKcxczcKv 0620562 4.94E-08 2.33E-07 6.74E-05 L

5.7L62 WBN-2-CKV-052-0552-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0520s63 4.94E-08 2.33E-07 6.74E-05 L

5.7L62 WBN-2-CKV-062-0563-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0620576 4.94E-08 2.33E-07 6.74E-05 1

5.7L62 WBN-2-CIry.062-O576-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0620577 4.94E-08 2.33E-07 6.74E-O5 L

5.7L62 WBN-2-CKV.O62-O577-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv o620s78 4.94E-08 2,33E-O7 5.74E-05 1

5.7L62 WBN-2-CKV.O62-0578-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0620579 4.94E-08 2,33E-07 5.74E-05 L

5.7L62 WBN-2-CKV.O62-0579-S CH ECK VALVE TRANSFERS CLOSED cKcxczcKv 0620592 4.94E-08 2.33E-07 6.74E-05 L

5.7L62 WBN-2-CKV-052-0592-S CH ECK VALVE TRANSFERS CLOSED cKcxczcKv 0520593 4.94E-08 2.33E-07 6.74E-05 1

5.7L52 WBN-2-CKV.O52-0593-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0520594 4.94E-08 2.33E-07 5.74E-05 L

5.7L62 WBN-2-CKV.O52-0594-S CH ECK VALVE TRANSFERS CLOSED CKCXC2CKV 0520595 4.94E-08 2.33E-O7 5.74E-05 1

5.7L62 WBN-2-CKV.062.0595-S CH ECK VALVE TRANSFERS CLOSED HOCXC2TNJ 0520555 7.49E-08 3.53E-07 5.74E-05 L

5.7L62 WBN-2-INJ-062-0555-S MAN UAL VALVE TRANSFERS CLOSED HOCXC2TNJ 0620557 7.49E-08 3.53E-O7 5.74E-05 L

5.7L62 WBN.2-I NJ-052-O557-S MAN UAL VALVE TRANSFERS CLOSED HOCXCzTNJ 0620558 7.49E-O8 3.53E-07 6.74E-O5 1

5.7L62 WBN.2.INJ-052-0558.S MAN UAL VALVE TMNSFERS CLOSED HOCXC2TNJ 06205s9 7.49E-08 3.53E-O7 6.74E-05 L

5.7L62 WBN-2-INJ-052-0559-S MAN UAL VALVE TRANSFERS CLOSED HOCXCzTSV 0520535 7.49E-08 3.53E-07 5.74E-05 L

5.7L62 WBN-2.ISV-062-0535.S MAN UAL VALVE TRANSFERS CLOSED HOCXCzTSV 0620s35 7.49E-08 3.53E-07 5.74E-05 L

5.7L62 WBN.2-ISV-062-0535-S MAN UAL VALVE TRANSFERS CLOSED HOCXC2TSV 0520548 7.49E-08 3.53E-07 5.74E-05 1

5.7L62 WBN-2-ISV-052-0548.S MAN UAL VALVE TRANSFERS CLOSED HOCXC2TSV 0520s50 7.49E-08 3.53E-07 5.74E-05 L

5.7L62 WBN.2.ISV-062-0550-S MAN UAL VALVE TRANSFERS CLOSED HOCXC2TSV 0620554 7.49E-08 3.53E-O7 5.74E-05 L

5.7L62 WBN-2-ISV-052-0564.S MAN UAL VALVE TRANSFERS CLOSED HOCXC2TSV 0520555 7.49E-08 3.53E-07 6.74E-05 1

5.7L62 WBN-2.ISV-052-0565-S MANUAL VALVE TRANSFERS CLOSED HOCXC2TSV 0520s55 7.49E-08 3.53E-07 5.74E-05 1

5.7L62 WBN-2-ISV-062-0555-S MAN UAL VALVE TRANSFERS CLOSED HOCXCzTSV 0620s67 7.49E-08 3.53E-O7 5.74E-05 L

5.7L62 WBN-2-!SV-052-0567-S MAN UAL VALVE TRANSFERS CLOSED BUSFR2BD 2354-G 1.04E-05 4.74E-O5 5.51E-05 1

5.5535 12OV AC VITAL INST POWER BOARD z-IV FAILS cKcxc2cKv 0520052s 4.94E-08 2.22E-07 5.41E-05 1

5.4898 W B N CKV-O 62-0525-A CH ECK VALVE TRAN S F E RS CLOS E D HOCXC2TSV 06200509 7.49E-08 3.35E-07 6.41E-05 L

5.4898 WBN-2-ISV-052-0509-A MANUAL VALVE TMNSFERS CLOSED HOCXCzTSV 06200527 7.49E-08 3.35E-07 6.41E-05 L

5.4898 W B N ISV-05 2-0527-A MA N UA L VALVE TMNS F E RS CLOS E D HOCXC2TSV 07000800 7.49E-08 3.35E-07 5.41E-05 1

5.4898 WBN-2-ISV-O7O-O8OO MAN UAL VALVE TRANSFERS CLOSED

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 209

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event CDF Importance RAW > 2 Event Pmbability FU BB RRW RAW DescHption HOCXC2lSV 07000801 7.49E-08 3.35E-07 6.41E-05 1

5.4898 WBN-2-ISV-O7O-0801 MAN UAL VALVE TRANSFERS CLOSED HOCXC2TSV 0700557A 7.49E-08 3.35E-07 5.41E-05 L

s.4898 WBN.2-ISV-O7O-0557A-A MAN UAL VALVE TRANSFERS CLOSED HOCXC2THV 0700554A 7.49E-08 3.36E-07 5.41E-05 L

5.4898 WBN-2.THV-O7O-0554A MAN UAL VALVE TRANSFERS CLOSED HORXC2TSV 0570500A 7.49E-O8 3.35E-07 5.41E-05 t

5.4898 WBN-2-ISV-O57.O6OOA-A MAN UAL VALVE TRANSFERS CLOSED HORXC2TSV 0570602A 7.49E-08 3.35E-07 5.41E-05 1

5.4898 W B N ISV-057 -0602A-A MAN UA L VA LVE TRAN S F E RS CLOSED HORXC2THV 0670601A 7.49E-08 3.36E-07 6.41E-05 L

5.4898 WBN-2-THV-O57.O6O1A.A THV VALVE TRANSFERS CLOSED MORXCoFCV 06700L44 9.77E-O7 4,33E-06 6.34E-05 1

5.4384 WBN-O-FCV-067 -OL4/.B MOV TRANSFERS CLOSE D cKcxczcKv 0700504A 4.94E-08 2.L9E-07 5.33E-05 1

5.4328 WBN-2-CKV.O7O-O5O4A-A CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 05300586 4.94E-08 2.L2E-O7 6.12E-05 L

5.2866 WBN-2.CKV-053.0585-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 06300587 4.94E-08 2.L2E-O7 5.12E-05 1

5.2855 WBN-2-CKV-063.0587-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 06300588 4.94E-08 2.L2E-07 6.12E-05 L

5.2866 WBN.2-CKV-053-0588-S CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 06300589 4.94E-08 2.L2E-07 5.12E-05 L

5.2865 WBN-2-CKV-053-0589-S CH ECK VALVE TRANSFERS CLOSED HOCXC2THV 05300582 2.81E-08 L.20E-07 5.L2E-05 L

s.2865 WBN-2-THV-063-0582-S TRANSFERS CLOSED (LOCKED THROTTLE)

HOCXC2THV 06300583 2.81E-08 L.20E-O7 5.12E-05 L

5.2856 WBN-2-THV-063-0583-S TRANSFERS CLOSED (LOCKED THROTTLE)

HOCXC2THV 05300584 2.81E-08 L.20E-07 6.L2E-05 L

5.2865 WBN-2-THV-053-0584-S TRANSFERS CLOSED (LOCKED THROTTLE)

HOCXCzTHV 05300585 2.81E-08 L.20E-07 5.12E-05 1

5.2855 wBN-2-THV-063-0s8s-S TRANSFERS CLOSED (LOCKED THROTTLE) cBKXO2SW 2354-G 4.10E-06 L.73E-05 5.03E-05 1

5.2199 Disconnect Switch in 120V AC Vital lnst Power Board 2-lV CBKXO2XSW 2354-G 4.10E-05 L.73E-05 5.03E-05 1

5.2199 Transfer Switch in L?:OV AC Vital lnst Power Board }-lV BUSFR1BD 211A-A 1.04E-05 4.19E-05 5.75E-05 L

5.0257 WBN-1-BD-211-A SHUTDOWN BOARD FAILS BATFROBAT 2362-E 7.44E-06 2.81E-05 5.40E-05 1

4.7832 BATT il FAlLS DURTNG OPERATlON (0-BAT-236-2-E\\

PCOFR1PMP O7OOOs1S!ET 8.57E-05 3.04E-04 5.01E-05 1.0003 4.5083 WBN-O.PMP-O7O-OO51.S PUMP CS FAILS TO OPERATE HORXCoTSV 05700546rE 2.73E-05 9.55E-05 4.99E-05 1.0001 4.4953 WBN-O-ISV-067 -0546-8 VALVE TRANSFERS CLOSED HXRPLOHTX O7OOO185IET 1.55E-05 5.39E-05 4.98E-05 1.0001 4.4842 WBN-O-HTX-O7O-0186 CCS HEAT EXCHANGER C PLUGGING

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 210

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Eesic,'Evellt GDF Importance RAW > 2 Event Probability R'

EB RRW RAW Description HXCRPOHTX O7OOO185IET 5.57E-05 1.90E-05 4.88E-05 1

4.4L64 WBN-O.HTX-O7O-0186 CCS HEAT EXCHANGER C EXCESSIVE LEAKAGE/RUPTURE MORFO1FCV 06700056 9.70E-04 3.25E-03 4.78E-05 1.0033 4.3449 Added for evaluation WBN-2-10-135 and WBN-2-11-0005 PTSF12PMP OO3OO1AS 1.05E-02 3.40E-02 4.55E-05 1.0352 4.2192 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1-3-1AS BUSFROBD 2362-E L.74E-06 5.09E-05 4.19E-05 1

3.9347 Failure of 125V DC Battery Boa rd 2 cB KFO2 B KR_z 1 118 16 I L6-A 2.55E-03 7.33E-03 4.11E-05 L.0074 3.8554 6.9KV SDBD BREAKER 1816 FAILS TO OPEN FNSFD2FAN O3O45O 4.80E-03 L.37E-Oz 4.08E-05 1.0139 3.8458 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR SEQFD2A-A 3.33E-03 9.50E-03 4.08E-05 1.0095 3.8446 SEQUENCER 2A-A FAILS (Unknown UNID)

DGGFD2GEN 0822A-A 7.15E-03 2.05E-02 4.09E-05 1.0209 3.8437 DIESEL GENERATOR 2A-A FAILS TO START AND RUN FIRST HOUR HOCXCoFCV 070000L2 7.49E-08 2,LLE-O7 4.03E-05 1

3.8226 WBN-0-FCV-070-0012-B TRANSFERS CLOSED (MOV LOCKED oPEN WlTH POWER REMOVED)

HOCXCoFCV 07000022 7.49E-08 2,LLE-07 4.03E-05 L

3.8226 w B N FCV-07 0-0022-8 TRAN S FE RS C LOS E D ( M OV LO CKE D oPEN WlTH POWER REMOVED)

HOCXCoTSV 07000503 7.49E-09 2.LLE-O7 4.03E-05 1

3.8226 WBN-O-ISV.O7O-0503 PUMP CS SUCTION VALVE TRANSFERS CLOSED HOCXC0ISV 07000s05 7.49E-08 2.LLE-07 4.03E-05 L

3.8226 WBN-O-ISV-O7O-0505 PUMP CS DISCHARGE VALVE TMNSFERS CLOSED HOCXC0lSV 07000s10 7.49E-08 2.LLE-07 4.03E-05 1

3.8226 WBN-O-!SV-O7O-0510-B VALVE TRANSFERS CLOSED HORXCoTSV 06700545 7.49E-08 2,LLE.O7 4.03E-05 L

3.8226 WBN-O-EV-oG7 -0546-8 VALVE TRANSFERS CLOSE D HORXCoISV 05701009 7.49E-08 2.tLE-07 4.03E-05 1

3.8226 WBN-O-ISV-067 -LOAg-B VALVE TRANSFERS CLOSE D HORXCoTSV 06701010 7.49E-08 2.LLE-A7 4.03E-05 1

3.8226 WBN-O.ISV-067 -LOLO-B VALVE TRANSFERS CLOSE D HORXC2F6/ 05700024 7.49E-08 2.LLE-O7 4.03E-05 1

3.8226 ERCW 28 SUPPLY HDR MOV WBN-2-FCV.67-24 TRANSFERS CLOSED HORXCaF$l 06700082 7.49E-48 2.LLE-O7 4.03E-05 1

3.8226 AUX BLDG HDR A ISO MOV WBN-2-FCV-57-S2TRANSFERS cLosED (LO/PR)

HORXC2FCV 06700128 7.49E-O8 2,LLE-07 4.03E-05 1

3.8226 WBN-2-FCV-57 -r28 TRANSFERS CLOSED (LO/PR)

HORXC2lSV 05705058 7.49E-08 2.LLE-O7 4.03E-05 1

3.8226 MANUAL VALVE WBN-2-57-5058 TRANSFERS CLOSED DAOFOaFCO 0304/,4 1.02E-03 2.88E-03 4.04E-05 1.0029 3.82L7 SUPPLY DAMPER 2.FCO.3O-444 OPENS

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 211

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event CDF lmportance RAW > 2 Event ProbabiliW FU BB RRW RAW Descrlptlon DAOFOzFCO 030460 1.02E-03 2.88E-03 4.04E-05 1.0029 3,82L7 EXHAUST FAN DAMPER 2-FCO-30-460 FAILS TO OPEN HOO(C2FCV 07000075 7.49E-Og 2.O2E-07 3.85E-05 1

3.7025 WBN-2-FCV-07O-0075-B TRANSFERS CLOSED (LOCKED OPEN wrTH POWER REMOVED)

BATFROBAT 2361-D 7.44E-06 2.00E-05 3.85E-05 1

3.693 BATT r FAlLS DURTNG OPERATlON (0-BAT-235-1-D) cKcxcocKv 07000s04 4.94E-08 L.29E-07 3.72E-05 L

3.5005 WBN-O.CKV-O7O.O5O4 CHECK VALVE TRANSFERS CLOSED BUSFROBD 2361-D L.74E-06 4.45E-05 3.67E-05 1

3.5585 Failure of 125V DC Battery Board 1 FNSFR2FAN O3O45O 2.66E-03 6.84E-03 3.67E-05 1.0059 3.5507 EXHAUST FAN 2-FAN-30.450 FAILS TO RUN DGGFRzGEN 0822A-A L.24E-02 3.2:0E-02 3.70E-05 1.0331 3.5548 DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR FANFR2FAN 030492 2.59E-04 5.41E-04 3.53E-05 1.0006 3.47L4 DG 2A-A ROOM ELEC PANEL / COMBUSTTON AtR FAN (WBN-2-FAN-30-492)

PRVFC2PCV 05800334 1.09E-03 2.68E-03 3.52E-05 L.OO27 3.4591 PORV I-PCV 58-334 FAILS TO CLOSE ON DEMAND PRVFC2PCV O58O34OA 1.09E-03 2.58E-03 3.51E-05 L.0027 3.4553 PORV I-PCV 68-340A FAITS TO CLOSE ON DEMAND MOCXC2FCV 07000003 4.23E-08 9.74E-08 3.29E-05 L

3.3005 WB N-2.FCV-O7O-OOO3 TRANSFERS CLOSE D HORXC1FCV 06700024 7.49E-09 L.72E-O7 3.28E-05 1

3.2979 ERCW 18 SUPPLY HDR MOV WBN-1-FCV.57-24 TRANSFERS cLosED (LO/PR)

HORXC1FCV 05700082 7.49E-08 L.72E-O7 3.28E-05 1

3.2979 LOCKED OPEN WBN-l-FCV-57 -S?TRANSFERS CLOSED HORXC1FCV 06700128 7.49E-09 L.72E-07 3.28E-05 L

3.2979 MOV WBN-1-FCV-57 -L28 TRANSFERS CLOSED (LOlpR)

HORXCIISV 0670s0s8 7.49E-09 L.72E-07 3.28E-05 1

3.2979 MANUAL VALVE WBN-1-57-5058 TRANSFERS CLOSED cB KFO2 B KR_2 1 1 1828 l 16-9 2.55E-03 5.80E-03 3.25E-05 1.0058 3.2682 5.9KV SDBD BREAKER 1828 FAILS TO OPEN DGGFDzGEN O822B.B 7.15E-03 t.6LE-02 3.23E-05 1.0164 3.2425 DIESEL GENERATOR FAILS TO START AND RUN FIRST HOUR (WBN-2-GEN -082-00028 -B)

FNSFD2FAN 030462 4.80E-03 1.08E-02 3.22E-05 1.0109 3.24L7 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR SEQFD2B-B 3.33E-03 7.48E-03 3.21E-05 1.0075 3.2378 SEQUENCER 2B-B FAILS (Unknown UNID)

DAOFOaFCO 030446 1.02E-03 2.25E-03 3.15E-05 1.0023 3.2025 SUPPLY DAMPER 2-FCO.30446 OPENS DAOFOzFCO 030452 1.02E-03 2.25E-03 3.15E-05 1.0023 3.2025 EXHAUST FAN DAMPER 2.FCO-30-452 FAILS TO OPEN HEXPL2HTX O82O72OA1-A 1.55E-05 3.24E-05 2.99E-05 1

3.0919 HEAT EXCHANGER zAL PLUGS HEXPLzHD( O82O72OA2-A 1.55E-05 3.24E-05 2.99E-05 L

3.0919 HEAT EXCHANGER 2A2 PLUGS cBKXOoBKR_23621L09-E 5.84E-07 L,42E-06 2.96E-05 L

3.0745 W B N B K R-?3q-00 OZ / I09-E B rea ke r Tra n sfe rs O p e n

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:212

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 BeCic'Event CDF lmportance RAW > 2 Event Probability R'

gB ftRtIu Rtw Description cKcFo2cKV 06300560 1.30E-05 2.69E-05 2.95E-05 L

3.0551 WBN-2-CKV.O63.O55O-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFozcKV 05300s51 1.30E-05 2.69E-05 2.95E-05 1

3.0551 WBN-2-CKV-063-0561-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 05300552 1.30E-05 2.69E-05 2.95E-05 L

3.0551 WBN-2-CKV-053-0562.S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 05300553 1.30E-05 2.69E-05 2.95E-05 1

3.0561 WBN.2-CKV-063-0563-S CHECK VALVE FAILS TO OPEN ON DEMAND PCOFD1PMP 07000515 1.07E-03 2,L2E-O3 2.83E-05 1.0021 2.9787 WBN-O.PMP-O7O-0051-S PUMP CS FAILS TO START ON DEMAND DGGFRzGEN 0822B-B L.24E-02 2.45E-02 2.83E-05 L.0252 2.9573 DG 2B-B FAILS FATLS TO RUN (WBN-z-GEN -082-00028 -B)

FNSFR2FAN 030452 2.66E-03 5.21E-03 2.79E-05 1.0052 2.9489 EXHAUST FAN 2-FAN-30-452 FAILS TO RUN FUSFP0FU 23621L0L-E 5.20E-07 1.00E-05 2.75E-05 1

2.9252 BATT !! FUSE F1Ol FAILS DURING OPERATION HORXO2TSV 05705058 3.19E-08 5.11E-08 2.74E-05 L

2.9t54 MANUAL VALVE WBN-2-57-5058 TRANSFERS OPEN (FLOW DTvERSTON)

HEXRPzHTX O8?O72OA1-A 5.57E-06 1.04E-05 2.68E-05 L

2.8762 HEAT EXCHANGER aAL RUPTURES HEXRP2HTX O82O72OA2-A 5.57E-05 1.04E-05 2.58E-05 L

2.8762 HEAT EXCHANGER 2A2 RUPTURES FANFR2FAN 030494 2.59E-04 4.77E-04 2.63E-05 1.0005 2.8405 DG 2B-B ROOM ELEC PANEL / COMBUSTTON AtR FAN (WBN-2-FAN-30-494)

BUSFROBD 2364G IE 3.80E-03 6.71E-03 2.52E-05 1.0068 2.7586 L25V DC VITAL BATTERY BOARD IV FAILS DURING OPERATION cKcFo2cKV 06300s10 1.30E-05 2.19E-05 2.4LE-05 1

2.6847 WBN-2.CKV-053-0510-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 06300ss1 1.30E-05 2.19E-05 2.41E-05 L

2.6847 WBN-2-CKV-053-0551-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 06300553 1.30E-05 2.19E-05 2.41E-05 L

2.6847 WBN-2.CKV.063-0553-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 05300sss 1.30E-05 2.19E-05 2.4LE-05 L

2.6847 WBN-2.CKV-053-0555-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 053005s7 1.30E-05 2.19E-05 2.4LE-O5 1

2.6847 WBN-2-CKV-063-0557-S CHECK VALVE FAILS TO OPEN ON DEMAND

Calculation No. MDN-000-999-2008-0 151 Rev: 001 Plant: WBN Unit 0 Page: 213

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 71 - Unitz Basic Event CDF Importance RAW > 2 Event Prpbability n,

BB RRW RAW Description cBKXOoBKR_236LlLOg-D 5.84E-07 1.15 E-05 2.40E-05 L

2.5826 w B N B K R-2 36-000 Ll L09 -D B R EAKE R TRAN S F E RS O p E N MOCXC2FCV 05300005 6.78E-07 1.14E-05 2.40E-05 L

2.6785 WBN-2-FCV-053-OOO5-B MOV TRANSFERS CLOSED MOCXC2FCV 0530003 5.78E-O7 1.14E-05 2.40E-05 1

2.6785 WBN-2-FCV-053-OOO3.A TRANSFERS CLOSED PUMP MINI-FLOW HEADER (LOCKED OPEN)

MOCXCZF$/ 0630022 6.78E-O7 1.14E-05 2.40E-05 L

2.6785 WBN-2-FCV-053-0022-B MOV TRANSFERS CLOSED (LOCKED oPEN)

MORXC2FCV 06766 9.77E-07 1.54E-05 2.40E-05 L

2.6779 2.FCV-67-66 MOV TRANSFERS CLOSED RCPSEAL4SO 2.50E-03 4.04E-03 2.31E-05 1.0041 2.6L22 RCP SEAL 48OGPM FNSFD1FAN 030461 4.80E-03 7.75E-03 2.31E-05 1.0078 2.6059 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR SEQFDlB-B 3.33E-03 5.35E-03 2.30E-05 1.0054 2.5053 SEQUENCER 1B-B FAILS (Unknown UNID)

DGGFD1GEN 08218-8 7.15E-03 1.15E-02 2.31E-05 L.OtL7 2.6049 DG 1B-B FAILS TO START AND RUN FIRST HOUR cB KFO 1 B KR_z LLLT 28 I L6-B 2.55E-03 4.10E-03 2.30E-05 1.0041 2.6039 WBN-1-BKR-2LL-L728/L6B BREAKER FArLS TO OpEN FNSFR1FAN O3O45T 2.66E-03 4.27E-43 2.29E-05 1.0043 2.5995 EXHAUST FAN 1-FAN-30-451 FAILS TO RUN DAOFO1FCO 0301145 1.02E-03 1.53 E-03 2.28E-05 1.0015 2.594L SUPPLY DAMPER 1-FCO-30-445 OPENS DAOFO1FCO 030461 1.02E-03 1.63E-03 2.28E-05 1.0016 2.594L EXHAUST FAN DAMPER 1.FCO.3O-461 FAILS TO OPEN DGGFR1GEN O821B.B L.24E-02 2.00E-02 2.31E-05 L.0204 2.594 DG 1B.B FAILS TO RUN FANFR1FAN 030493 2.59E-04 4.04E-04 2.23E-05 1.0004 2.5575 DG 1B-B ROOM ELEC PANEL I COMBUSTTON ArR FAN (WBN-1-FAN-30-493)

FUSFP0FU 236LlLOL-D 5.20E-07 8.05E-07 2.22E-05 I

2.5505 BATT ! FUSE F1Ol FAILS DURING OPERATION (BTWN BATT I AND 125VDC BD t) cKcFoocKV 07000504 1.30E-05 2.00E-05 2.20E-05 L

2.5384 WBN-O-CKV.O7O-0504 CHECK VALVE FAI6 TO OPEN ON DEMAND HEXPL2HTX O82O72OB1-B 1.55E-05 2.L9E-05 2.O2E-05 L

2.4r74 HEAT EXCHANGER zBL PLUGS HEXPLzHTX O82O72OB2-B 1.55E-05 2.19E-05 2.02E-05 L

2,4L74 HEAT EXCHANGER 282 PLUGS PMAF12PMP OO3OO118 1.08E-03 1.53E-03 2.02E-05 1.0015 2.4LO2 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-2.3-118.

A RCPSEALlS2 2.08E-01 3.65E-01 2.52E-05 L.576 2.3959 RCP SEAL L82 GPM PMAF12PMP OO3OO128 1.08E-03 1.50E-03 1.98E-05 1.0015 2.388 PUMP FAILS TO STARTAND RUN FOR 1 HOUR WBN-2-3-L28-B

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 214

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unal? Basic Event CDF lmpoilance RAW > 2 Event Prcbability R'

BB ERIfif Rf,W Description HEXPL1HTX O82O72OB1-B 1.55E-05 2.14E-05 1.98E-05 L

2.3843 HEAT EXCHANGER 1B1 PLUGS HEXPL1HTX O82O72OB2-B 1.55E-05 2.L4E-05 1.98E-05 1

2.3843 HEAT EXCHANGER TB2 PLUGS CKRRIOCKV 0670503BIE 2.59E-04 3.58E-04 1.97E-05 1.0004 2.379 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-O-67-503B CKRRIOCKV O67O5O3DIE 2.59E-04 3.58E-04 1.97E-05 1.0004 2.379 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE WBN-O-57-503D DGGFR PFP 2.29E-03 3.14E-03 1.97E-05 1.0032 2.3786 Diesel Generator fails to run after first hour DGGFD FP 5.46E-03 7.57E-03 1.98E-05 1.0076 2.378 Diesel Generator fails to start or during first hour of operation PCOFDZPMP 0700059 1.07E-03 1.39E-03 1.85E-05 1.0014 2.2947 WBN-2-PMP-O7O-0059 PUMP 2A.A FAILS TO START ON DEMAND HEXRPIHD( O82O72OB1-B 5.57E-05 7.L3E-06 1.83E-05 1

2.2808 HEAT EXCHANGER 1B1 RUPTURES HEXRP1HTX O82O72OB2-B 5.57E-06 7.L3E-05 1.83E-05 L

2.2808 HEAT EXCHANGER LB? RUPTURES cBKXOoBKR_236212O4-E 4.10E-05 5.11E-05 1.78E-05 L

2.246 NORMAL 125V DC SUPPLY BREAKER TRANSFERS OPEN MOCFO2FCV 00100051 1.86E-04 2.32E-04 1.78E-05 1.0002 2.2445 Motor operated valve fails to open (clean water)

FUSFP0FU 2362120L-E 3.12E-06 3.80E-05 L.74E-05 1

2.?L84 125VDC SUPPLY FUSE 0-236-2/2OL-E CKRRIOCKV O57O5O3FIE 2.598-04 3.13E-04 L.73E-05 1.0003 2.2086 DISCHARGE CHECK VALVE 5O3F GROSS REVERSE LEAKAGE wBN-0-57-503F CKRRIOCKV O67O5O3HIE 2.59E-04 3.13E-04 L.73E-05 1.0003 2.2086 DISCHARGE CHECK VALVE 5O3H GROSS REVERSE LEAKAGE wBN-0-57-503H cKcFo2cKV 0700504A 1.30E-05 1.54E-05 1.69E-05 L

2.L8L6 WBN-2-CIry.O7O-O5O4A.A CHECK VALVE FAILS TO OPEN ON DEMAND BUSFR2MCC 21381-8 1.04E-05 L.23E-05 1.58E-05 L

2.L76L 48OV REACTOR MOV BOARD aBL.B FAIls DURING OPERATION HXCRP2HTX 0680008 5.57E-06 6.52E-06 1.57E-05 1

2.L705 WBN-2-HTX-068-OOO8 THERMAL BARRIER H EAT EXCHANGER

  1. L EXCESSTVE LEAKAGE/RUPTURE HXCRP2HTX 0580031 5.57E-05 6,52E-05 1.67E-05 L

2.L705 WBN-2.HTX-058-0031 THERMAL BARRIER H EAT EXCHANGER

  1. 2 EXCESSTVE LEAKAGE/RUPTURE HXCRP2HTX 06800s0 5.57E-05 6.52E-06 1.67E-05 1

2.L705 WBN-2-HTX.O68.OO5O THERMAL BARRIER H EAT EXCHANGER

  1. 3 EXCESSTVE LEAKAGE/RUPTURE

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:215

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77 -- Unit 2 Basic Event GDF lmportance RAW > 2 Event Probability FV BB RRW RAW Description HXCRPzHTX 0580073 5.57E-06 5.52E-05 L.67E-05 1

2.L705 WBN-2-HTX.O68-0073 THERMAL BARRIER H EAT EXCHANGER

  1. 4 EXCESSTVE LEAKAGE/RUPTURE PMAFRzPMP OO3OO118 L.28E-O4 1.49E-04 1.57E-05 1.0001 2.L67 PUMP FAILS AFTER 1 HOUR WBN-2-3-118-A PMAFR2PMP OO3OO128 L.28E-04 L.49E-04 1.65E-05 1.0001 2.L6L4 PUMP FAILS AFTER 1 HOUR WBN-2-3-L28-B HEXRP2HD( O82O72OB1-B 5.57E-06 6.42E-06 1.65E-05 L

2.1531 HEAT EXCHANGER zBL RUPTURES HEXRPzHTX O82O72OB2-B 5.57E-05 6.42E-06 1.65E-05 L

2.1531 HEAT EXCHANGER 282 RUPTURES HORXOIlSV 6705068 3.19E-08 3.51E-08 t.62E-05 L

2.1309 MANUAL VALVE WBN-2-67-5068 TRANSFERS OPEN (FLOW DTvERStON)

FNSFR2FAN O3OOO214 2.65E-03 2.95E-03 1.59E-05 1.003 2.1095 DC EMERGENCY EXHAUST FAN FAILS TO RUN AFTER 1ST HOUR WBN 3O-2L4 AOCFO2PCV 00300122 8.83E-05 9.76E-05 1.58E-05 1.0001 2.LO6L AIR OPERATED VALVE FAILS TO OPEN (clean water) WBN-2 L22 MOCXC2FCV 0700004 6.78E-07 7.48E-07 1.58E-05 L

2.LO4 WBN-2-FCV-070-0004 VALVE TRANSFERS CLOSED (LOCKED oPEN)

MOO(C2FCV 0700087 6.78E-O7 7.48E-07 1.58E-05 1

2.L04 WBN-2-FCV-O7O-0087-B MOV TRANSFERS CLOSED MOCXC2FCV 0700090 6.78E-07 7.48E-O7 1.58E-05 L

2.L04 WBN-2-FCV-O7O-OO9O-A MOV TRANSFERS CLOSED MOCXCZF$l 0700133 6.78E-07 7.48E-07 1.58E-05 1

2.L04 WBN-2-FCV-O7O-0133.A CONTAI N M ENT ISOLATION TRANSFERS CLOSED MOO(C2FCV 0700134 6.78E-O7 7.48E-07 1.58E-05 1

2.L04 WBN-2-FCV-O7O-0134.8 CONTAI N M ENT ISOLATION TRANSFERS CLOSED AOCFO2P6/ 00300132 8.83E-05 9.70E-05 1.57E-05 1.0001 2.0989 AIR OPERATED VALVE FAILS TO OPEN (clean water) WBN-2 r32 cBKXOoBKR_236413O4-G 4.10E-05 4.47E-06 1.56E-05 1

2.0894 NORMAL 125V DC SUPPLY BREAKER TRANSFERS OPEN cKcxc2ctry o70067L 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN-2-CKV.O7O-0671 CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0700679 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN-2-CKV-O7A-O679 CHECK VALVE TRANSFERS CLOSED cKcxc2cKv 0700581A 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN.2.CKV-O7O-0581A CHECK VALVE TRANSFERS CLOSED CKCXC2CKV 07006818 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN-2.C!ry.070.06818 CHECK VALVE TRANSFERS CLOSED cKcxczcKv 0700581c 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN-2.CKV.O7O-0681C CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0700681D 4.94E-08 5.34E-08 1.54E-05 1

2.0801 WBN-2-CKV-O7O-0581D CHECK VALVE TRANSFERS CLOSED cKcxc2cKv 0700682A 4.94E-08 5.34E-08 1.54E-05 I

2.0801 WBN.2-CKV-O7O-0682A CH ECK VALVE TRANSFERS CLOSED

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:216

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 77

  • Unit 2 Basic Event GDF Importance RAW > 2 Event Probability FU BB BR1TU BAW Description CKCXC2CKV 07006828 4.94E-08 5.34E-08 1.54E-05 L

2.0801 WBN-2-CKV-O7O-05828 CHECK VALVE TRANSFERS CLOSED cKcxczcKv 0700582c 4.94E-08 5.34E-08 1.54E-05 L

2.0801 WBN-2-CKV-O7O-0582C CH ECK VALVE TRANSFERS CLOSED cKcxc2cKv 0700682D 4.94E-08 5.34E-08 1.54E-05 I

2.0801 WBN-2.CKV-070.0682D CH ECK VALVE TMNSFERS CLOSED HOCXC2TSV 0700501 7.49E-08 8.09E-08 1.54E-05 t

2.0801 WBN-2-ISV-O7O-0501 MANUAL VALVE TRANSFERS CLOSED HOCXC2TSV 0700516 7.49E-08 8.09E-08 1.54E-05 1

2.0801 WBN-2-ISV-O7O-0516 MANUAL VALVE TRANSFERS CLOSED HOCXC2TSV 0700680 7.49E-08 8.09E-08 1.54E-05 1

2.0801 WBN-2.ISV-O7O-0580 MANUAL VALVE TRANSFERS CLOSED HOCXC2TSV 0700590 7.49E-08 8.09E-08 1.54E-05 L

2.0801 WBN-2-ISV-O7O-0690 MANUAL VALVES TRANSFERS CLOSED HOCXC2TSV 0700736 7.49E-08 8.09E-08 1.54E-05 1

2.0801 WBN-2-ISV-O7O-0735 MANUAL VALVES TRANSFERS CLOSED HOCXC2THV 0700684A 7.49E-08 8.09E-08 1.54E-05 L

2.0801 WBN-2-THV-O7O-0684A MAN UAL VALVES TRANSFERS CLOSED HOCXC2THV 07006848 7.49E-08 8.09E-08 1.54E-05 L

2.0801 WBN-2-THV-O7O-05848 MAN UAL VALVES TRANSFERS CLOSED HOCXC2THV 0700684C 7.49E-08 8.09E-08 1.54E-05 L

2.0801 WBN-2-THV-O7O-0584C MAN UAL VALVES TRANSFERS CLOSED HOCXCzTHV 0700684D 7.49E-08 8.09E-08 1.54E-05 L

2.0801 WBN-2-THV-070.0584D MAN UAL VALVES TRANSFERS CLOSED MORXC1FCV 06767 9.77E-07 1.04E-05 1.51E-05 L

2.0601 1-FCV-57-57 MOV TRANSFERS CLOSED SWPFD2PS OO3O138A L.L7E-04 L.2LE-04 1.48E-05 1.0001 2.0353 PRESSURE SWITCH WBN-2-PS-3-138A FAI LS cBKXO2BKR_z LZBLI&B-B 4.10E-05 4.L7E-O6 L.45E-05 L

2.0L49 48OV SDBD SUPPLY TO RMOV BOARD 2B1-B (2-BKR -2r2-BLl88-B) cB KXO 2 B KR_2 L3BL/ LA 1-B 4.10E-06 4.L7E-O6 1.45E-05 L

2.0L49 48OV RMOV BOARD NORMAL SUPPLY BREAKER TRANSFERS OPEN FUSFPoFU 2364/30L-G 3.12E-05 3.15E-06 1.45E-05 1

2.013 125VDC SUPpLy FUSE O-236-4/F301-G Note: this table does not include CCF, HEPs, or r&M

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Table 78 - Unit I Test and ilaintenanee GDF lmpofiance F-V > 0.5o/o Event Probability FU BB RRW BAW Deecrlptlon MTM 1GEN 0821A-A 1.10E-02 2.53E-02 3.20E-05 1.0259 3.2725 DI ESEL 1A-A MAI NTENANCE MTM OCHRG2.E 2.20E-03 2.t5E-02 1.36E-04 L.022 L0.7459 125VDC CHARGER II MAINTENANCE MTM 1PMP O52O1O8A 3.78E-03 2.O6E-O2 7.57E-O5 L.OzL 5.4185 WBN-1.PMP-052-0108-A CCP 1A-A !N MAINTENANCE MTM 1PMPOO3OO1AS 8.52E-03 1.85E-02 3.03E-05 1.0189 3.1513 PUMP WBN-1-3-1AS IN MAINTENANCE MTM 1GEN 0821B-B L.22E-O2 1.45E-02 1.55E-05 t.ot47 2,L743 DIESEL 1B-B MAINTENANCE MTM PMPOMDPO6TA 5.52E-04 1.43E-02 3.05E-04 1.0145 22.967t ERCW TRAIN A UNAVAIIABLE DUE TO MAINTENANCE MTM 2GEN 08228-8 t.o7E-oz 1.38E-02 1.80E-05 1.014 2,2777 DIESEL 2B-B MAINTENANCE MTM 2GEN 0822A-A 1.51E-02 1.13E-02 1.04E-05 1.0114 L.737 DIESEL 2A.A MAI NTENANCE MTM 1FAN O3OOO183 2.00E-03 1.09E-02 7.55E-05 1.011 6.4L45 CCP A ROOM COOLER FAN !N MAINTENANCE TTM 1FAN O3OOO183 2.00E-03 1.09E-02 7.55E-05 1.011 6,4L45 CCP A ROOM COOLER FAN IN TEST

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Table 79 - Unit I Teet and ltaintdnance CDF lmportance RAW > 2 Event ProbabiliW R/

BB RRW RAW Description MTM PMPOMDPO6TA 6.52E-04 L.43E-02 3.06E-04 1.0145 22.967L ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM OCHRG2.E 2.20E-03 2.L5E-02 1.35E-04 L.022 LO.7459 125VDC CHARGER II MAINTENANCE MTM PMPOMDPOSTB 2.83E-05 2.45E-04 1.20E-04 1.0002 9.645 ERCW PUMP TRAIN B UNAVAILABLE DUE TO MAINTENANCE MTM 1PMP 0700046A 5.97E-04 4.41E-03 1.03E-04 1.0044 8.3768 WBN-1-PMP.O7O-OO46.A CCS PUMP 1A-A IN MAINTENANCE TTM 1GEN 0821A-A 2.36E-04 5.18E-04 3.05E-05 1.0005 3.1956 DIESEL 1A-A TESTING MTM 1PMPOO3OOTAS 8.s2E-03 1.85E-02 3.03E-05 1.0189 3.1513 PUMP WBN-1-3-1AS IN MAINTENANCE TTM 1PTSOO3OO1AS 8.49E-04 1.82E-03 2.98E-05 1.0018 3.L404 PUMP WBN-1-3-1AS IN TESTING MTM 1MCC 21381-8 2.15E-04 3.81E-04 2.47E-05 1.0004 2.77L9 48OV RMOV BOARD 181-8 MAINTENANCE MTM 2GEN 08228-8 L.O7E-02 1.38E-02 1.80E-05 1.014 2.2777 DI ESEL 2B-B MAINTENANCE TTM 2GEN 08228-8 L.92E-O4 2.37E-04 1.71E-05 1.0002 2.2322 DIESEL 2B-B TESTING MTM 1GEN 0821B-B L.22E-42 L.45E-02 1.55E-05 L.OL47 2.L743 DIESEL 1B-B MAI NTENANCE MTM 1PMPOO3OO118 3.84E-03 4.41E-03 1.50E-05 L.0044 2.L448 PUMP WBN-1.-3-118-A IN MAINTENANCE TTM 1GEN 0821B-B 2.60E-04 2.85E-04 1.53E-05 1.0003 2.LOL4 DIESEL 1B-B TESTING MTM 1PMPOO3OOLaB 4.22E-03 4.25E-03 1.40E-05 1.0043 2.0031 PUMP WBN-1-3-128-B IN MAINTENANCE MTM PMPOMDPOSTA 5.52E-04 1.43E-02 3.05E-04 1.0145 22.957L ERCW TRAIN A UNAVAIIABLE DUE TO MAINTENANCE MTM OCHRGz-E 2.20E-03 2.L5E-02 1.36E-04 L.022 L0.7459 125VDC CHARGER II MAINTENANCE MTM PMPOMDPOoTB 2.83E-05 2.45E-04 L.20E-04 1.0002 9.545 ERCW PUMP TRAIN B UNAVAIIABLE DUE TO MAINTENANCE MTM 1PMP 0700046A 5.978-04 4.41E-03 1.03E-04 1.0044 8.3758 WBN-1-PMP-O7O-0046-A CCS PUMP 1A-A IN MAINTENANCE TTM 1PMP 0700046A 1.63E-05 1.15E-04 9.92E-05 1.0001 8.133 WBN-1-PMP-O7O-0046-A CCS PUMP 1A-A IN TEST MTM 1MCC ZL4BL-B 2.15E-04 1.40E-03 9.07E-05 1.0014 7.5L57 480VAC C&A VB 181-8 (1-MCC-2L4-8001-B) MATNTENANCE MTM 1MCC ZL4AL-A 2.L5E-O4 L.27E-03 8.20E-05 1.0013 5.8952 480VAC C&A VB 1A1-A (1-MCC-214-A001-A) MATNTENANCE

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SUMMARY

Table 80 - Unit 2 Test and taintenance CDF lmportance F-V >0.5%

Event Probability RT BB RRW RAW Description MTM 2GEN 0822A-A 1.51E-02 3.O2E-O2 2.86E-05 1.0311 2.9695 DI ESEL 2A-A MA! NTENANCE MTM 2PMP O52O1O8A 3.78E-03 2.03E-02 7.58E-05 L.0207 5.3554 WBN-2-PMP-062-0108-A CCP 1A-A IN MAINTENANCE MTM 2PMPOO3OO1AS 8.52E-03 L.72E-O2 2.88E-05 L.OL75 3.0018 PUMP WBN-2-3-1AS IN MAINTENANCE MTM 1GEN 08218-8 L.22E-02 1.55E-02 1.83E-05 1.0159 2.2646 DIESEL 1B.B MAINTENANCE MTM 2GEN 08228-8 L.O7E-Oz 1.36E-02 1.82E-05 1.0138 2.2605 DIESEL 2B-B MAINTENANCE MTM 2FAN O3OOO183 2.00E-03 1.05E-02 7.47E-O5 1.0106 6.22L8 CCP A ROOM COOLER FAN IN MAINTENANCE TTM zFAN O3OOO183 2.00E-03 L.05E-02 7.47E-O5 1.0106 6.22L8 CCP A ROOM COOLER FAN IN TEST MTM PMPOMDPOSTOOO4T 1.30E-02 6.92E-03 7.51E-05 1.007 1.5258 PUMP WBN 67-47 MAINTENANCE MTM PMPOMDPOSTOOOss 1.30E-02 5.92E-03 7.6LE-06 L.OO7 1.5258 PU MP WBN-O-67.55 MAINTENANCE TTM PMPOMDPOGTOOO4T 1.30E-02 6.92E-03 7.51E-05 L.OO7 1.5258 PU M P WBN 67 -47 TESTI NG TTM PMPOMDPO6TOOO55 1.30E-02 5.92E-03 7.61E-06 1.007 1.5258 PU M P WBN-O-67-55 TESTING MTM 1GEN 4821A-A 1.10E-02 5.51E-03 7.29E-06 1.0055 1.5045 DIESEL 1A-A MAI NTENANCE MTM PMPOMDPOSTA 5.52E-04 5.54E-03 L.2LE-O4 1.0056 9.4923 ERCW TRAIN A UNAVAIIABLE DUE TO MAINTENANCE

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Table 8l - Unit 2 Test and Xlalntenance CDF lmportance RAW > 2 Event Probability RI BB RRW RAW Description MTM 2MCC ZL4AL-A 2.15E-04 3.60E-03 2.39E-04 1.0035 L7.724L 480VAC C&A VB 2A1-A (2-MCC-2L4-A001-A) MATNTENANCE MTM PMPOMDPOSTB 2.83E-05 3.81E-04 L.92E-04 1.0004 L4.4692 ERCW PUMP TRAIN B UNAVAILABLE DUE TO MAINTENANCE MTM PMPOMDPOSTA 6.52E-04 5.54E-03 L.2LE-O4 1.0056 9.4923 ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM zPMP O7OOO59 5.97E-04 4.03E-03 9.53E-05 1.004 7.7392 WBN-2-PMP-O7O-0059 CCS PUMP 2A-A IN MAINTENANCE TTM 2PMP O7OOO59 1.63E-05 L.O7E-04 9.37E-05 1.0001 7.56L2 WBN-2-PMP-O7O-OOO59 CCS PUMP 2A-A IN TEST MTM 2PMP 0620108A 3.78E-03 2.03E-02 7.58E-05 L.0207 6.3554 WBN-z-PMP.O62.O1O8-A CCP 1A-A IN MAINTENANCE MTM 2FAN O3OOO183 2.00E-03 1.05E-02 7.47E-O5 1.0105 6.22L8 CCP A ROOM COOLER FAN IN MAINTENANCE TTM 2GEN 08228-8 1.92E-04 2.90E-04 2.16E-05 1.0003 2.5L24 DIESEL 2B-B TESTING MTM 1GEN 08218-8 t.22E-O2 1.56E-02 1.83E-05 1.0159 2.2646 DI ESEL 1B-B MAINTENANCE MTM 2GEN 0822B-B L.O7E-02 1.36E-02 1.82E-05 1.0138 2.2605 D! ESEL 2B.B MAI NTENANCE TTM 1GEN 08218-8 2.60E-04 3.22E-04 t.77E-05 1.0003 2.2386 DIESEL 1B.B TESTING MTM 2MCC 2L381-B 2.L5E-04 2.34E-O4 1.55E-05 1.0002 2.089 48OV RMOV BOARD 2B1-B MAINTENANCE

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SUMMARY

Tahle 82 -- LERF By Accident Sequence for Unit I Sequenoe NumbEr of Gutsets Frequency (per reactor-year)

U1 L2FBLERFOO4 15,539 4.18E-07 37.23%

U1 L2FLLERFO3s 7,95L t.64E-07 L4.6L%

U1 L2FBLERFOOs 7,33L 1.63E-O7 L4.47%

U1 L2FHLERFO3S 5,720 1.18E-07 LO.5L%

U1 L2FHLERFO39 5,053 7.97E-O8 7.OgYo U1 L2FLLERFO19 4,334 3.84E-09 3.42%

U1 L2FHLERFOO1 4,070 3.45E-09 3.08%

Ul L2FLLERFOO1 4,050 1.80E-09 L.6L%

U 1 L2FLLERFO14 3,505 1.45E-09 L.29%

U1 L2FLLERFOLT 2,7O9 1.45E-09 L.2976 U1 L2FBLERFOO3 2,628 8.24E-09 o.73%

U1 L2FLLERFO13 1,831 5.55E-09 0s9%

U1 L2FILERFOO1 L,705 5.65E-09 4.59%

U1 L2FLLERFO4T 1,611 5.53E-09 0.58%

U1 L2FILERFOO2 L,423 6.32E-09 0.56%

Ul L2FLLERFOO2 L,402 6.20E-09 0.55%

U1 L2FHLERFOO3 1,183 4.80E-09 0.43%

Total Note: Unit 2 similar.

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SUMMARY

Table 83 -- Breakdown of LERF Cutsets in Each Frequency Range, Unatz Frequency Range (events per yeaf)

Number of Gutsets

> 10-'

2 19.30%

10-o to 10-'

15 29.90%

10-" to 10 57 18.00%

10- to 10-'

508 9.50%

1o-" to 1o-

4,522 10.70o/o 10- to 10-'

27,769 6.60%

3E 1 0- to 1 0-

50,047 2.30o/o Note: Unit 1 similar

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 223

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SUMMARY

Table 84 - Top 100 Cutsets for Unit 1 LERF Table 85 - Top 100 Cutsets for Unat 2 LERF iH Acrobat Docurrc Acrobat Docunent

I Calculation No. MDN-000-999-2ggg-g t--'--'-"-""-""-'-'ttt-l I subject WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I I The information previously provided in this table I I The information previously provided in this table I I resides in the Quantification Notebook (MDN-I I resides in the Quantification Notebook (MDN-l I

000-999-2008-0147, Ref44).

I I 000-999-2008-0147. Ref44).

I I

I I

I Calculation No. MDN-000-999-2996-9 r "'

I I

I l

I

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I I

I The information previously provided in this table I I The information previously provided in this I I I resides in the Quantification Notebook (MDN-000- l I table resides in the Level2 (LERF) Notebook I I l

999-2008-0147, Ref 44).

I I (MDN-000-999-2008-0148, Ref 40).

I I

-l iousty provided i@

I resides in the Quantification Notebook (MDN-000-I l

999-2008-0147, Ref 44\\.

I

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page:226

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SUMMARY

Table 91 -- LERF By Initiator for Unit I LERF (per reactor-vear)

Percent Contribution lnitiatiilg Event 2.48E-07 22.04o/o Flood event nduced by rupture of RCW line in room 772.0-AB 2.48E-07 22.04o/o Flood event nduced by rupture of RCW line in room 772.0-Ag 1.20E-07 10.69%

Loss of Offsite Power (Grid Related) 1.02E-07 9.08%

Loss of Offsite Power (Plant Centered) 6.61E-08 5.89%

F ood event nduced by break of HPFP line in room 757.0-A2 4.95E-08 4.41o/o F ood event nduced by break of HPFP line in room 757.0-A24 3.66E-08 3.25o/o F ood event nduced by rupture of RCW line in room 757.0-A17 3.66E-08 3.25o/o F ood event nduced by rupture of RCW line in room 757.0-Ag 3.35E-08 2.98o/o Loss of Offsite Power (Weather lnduced) 2.88E-08 2.57o/o Small LOCA Stuck Open Safety Relief Valve 2.51 E-08 2.24o/o Flood event induced by break of HPFP line in room 757.0-A5 2.08E-08 1.85o/o Total Loss of Component Cooling System Unit 1 1.94E-08 1.73o/o Flood event nduced by break of HPFP !i ne n room 757.0-A21 1.86E-08 1.660/o Flood event nduced by break of HPFP li ne n room 772.0-47 1.82E-08 1.62%

Flood event nduced by break of HPFP li ne n room 772.0-A10 8.00E-09 0.71o/o ISLOCA RHR PUMP SEAL INITIATOR FLAG 6.10E-09 0.54o/o Total Loss of ERCW 5.59E-09 0.50%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 1 5.59E-09 0.50%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 2 5.59E-09 0.50%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 3 5.59E-09 0.50%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 4 2.24E-09 0.20o/o Loss of Battery Board 2 1.59E-09 0.14o/o Reactor Trip 1.15E-09 0.10%

Turbine Trip 1.00E-09 0.09%

SLOCA ON COLD LEG 1 1.00E-09 0.09%

SLOCA ON COLD LEG 2 1.00E-09 0.09%

SLOCA ON COLD LEG 3 1.00E-09 0.09%

SLOCA ON COLD LEG 4 6.07E-10 0.05%

lnadvertent Closure of 1 MSIV 5.95E-10 0.05%

Partial Loss of Main Feedwater 5.78E-10 0.05o/o Total Loss of Main Feedwater 5.53E-10 0.05%

Loss of Component Coolinq Svstem Train 1A 4.63E-10 0.04%

SG1 S THE FAULTED SG 4.63E-10 0.04o/o SG2 S THE FAULTED SG 4.63E-10 0.04%

SG3 S THE FAULTED SG 4.63E-10 0.04o/o SG4 S THE FAULTED SG 3.31 E-10 0.03%

Loss of Condenser Vacuum 3.27E-10 0.03%

$praV event on dryers 1.12E-06 TOTAL

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:227

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SUMMARY

Table 92 -- Unit I LERF Comparison LERF (oer reactor-vear)

Difference l,nitiatinE Event GAFTA Rl CAFTA RO 4.95E-08 1.52E-09 225%

Flood event induced by HPFP break n 757.0-424 2.51E-08 7.74E-09 224%

F ood event induced by HPFP break n 757.0-A5 t.82E-08 5.51E-09 224%

F ood event induced by HPFP break n772.0-A10 1.94E-09 5.99E-09 224%

F ood event induced by HPFP break n757.0-A2L 1.85E-08 5.75E-09 224%

F ood event induced by HPFP break n 772.0-A7 5.51E-08 2.05E-09 223%

F ood event induced by HPFP break n757.O-A2 2.88E-08 9.25E-09 zLL%

Small LOCA Stuck Open Safety Relief Valve 5.07E-10 2.02E-10 200%

lnadvertent Closure of 1 MSIV 1.00E-09 3.53E-10 L77%

SLOCA ON COLD LEG 1 1.00E-09 3.63E-10 L77%

SLOCA ON COLD LEG 2 1.00E-09 3.63E-10 L77%

SLOCA ON COLD LEG 3 1.00E-09 3.53E-10 L77%

SLOCA ON COLD LEG 4 3.66E-08 1.81E-08 LOz%

Flood event induced by RCW rupture n 757.O-AL7 3.65E-08 1.81E-08 LOz%

Flood event induced by RCW rupture n 757.4-A9 2.48E-O7 1.51E-07 64%

Flood event induced by RCW rupture n772.0-A8 2.48E-07 1.51E-07 64%

Flood event induced by RCW rupture n772.0-A9 8.00E-09 7.95E-09 L%

ISLOCA RHR PUMP SEAL INITIATOR FLAG 2.08E-08 2.10E-09

-L%

Total Loss of Component Cooling System Unit 1 1.59E-09 1.93E-09

-L7%

Reactor Trip 2.24E-09 3.14E-09

-29%

Loss of Battery Boa rd 2 t.20E-07 1.95E-07

-38%

Loss of Offsite Power (Grid Related)

L.O2E-07 1.59E-07

-40%

Loss of Offsite Power (Plant Centered) 5.53E-10 9.44E-10

-4L%

Loss of Component Cooling System Train 1A 3.35E-08 6.34E-08

-47%

Loss of Offsite Power (Weather lnduced) 5.78E-10 1.44E-09

-60%

Total Loss of Main Feedwater 1.15E-09 3.52E-09

-67%

Turbine Trip 5.95E-10 2.L4E-09

-72%

Partial Loss of Main Feedwater 3.31E-10 1.33E-09

-75%

Loss of Condenser Vacuum 6.10E-09 2.79E-48

-78%

Total Loss of ERCW 5.59E-09 L.62E-O7

-97%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 1 5.59E-09 L.62E-07

-97%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 2 5.59E-09 L.62E-07

-97%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 3 5.59E-09 L.62E-07

-97%

SECONDARY BREAK OUTSIDE CONTAINMENT SG 4 4.63E-10 1.45E-08

-97%

SG1 !S THE FAULTED SG 4.53E-10 1.45E-09

-97%

SG2 IS THE FAULTED SG 4.63E-10 1.45E-09

-97%

SG3 IS THE FAULTED SG 4.63E-10 1.45E-09

-97%

SG4 IS THE FAULTED SG 3,27E-LO Spray event on dryers 4.95E-08 1.52E-09 225%

Flood event induced by HPFP break in757.0-A24 2.51E-09 7.74E-09 22496 Flood event induced bv HPFP break in 757.0-A5

Calculation No. M DN-000-999-2008-0 1 51 Rev: 001 I Plant: WBN Unit 0 Page:228

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SUMMARY

Table 9S -- LERF By lnitiator for Unit 2 LERF (per reac'tor-vear)

Percent Gontribution lnitiating Event 2.48E-07 21.31o/o Flood event nduced by RCW rupture in 772.0-A8 2.48E-07 21.31o/o Flood event nduced by RCW rupture in 772.0-Ag 1.34E-07 11.57%

Loss of Offsite Power (Grid Related) 1.13E-07 9.75%

Loss of Offsite Power (Plant Centered) 6.61E-08 5.69%

F ood event nduced by HPFP break n 757.0-A2 4.95E-08 4.260/o F ood event nduced by HPFP break n 757.0-424 3.66E-08 3.15o/o F ood event nduced bv RCW rupture in 757.0-A17 3.66E-08 3.15o/o F ood event nduced by RCW rupture in 757.0-Ag 3.59E-08 3.09%

Loss of Offsite Power (Weather lnduced) 2.88E-08 2.48o/o Small LOCA Stuck Open Safetv Relief Valve 2.51 E-08 2.160/o Flood event induced by HPFP break tn 757.0-A5 2.08E-08 1.79o/o Total Loss of Component Coolinq System Unit 2 1.94E-08 1.670/o Flood event induced by HPFP break in 757.0-A21 1.86E-08 1.610/o Flood event induced by HPFP break in 772.0-A7 1.82E-08 1.56%

Flood event induced by HPFP break in 772.0-A10 1.44E-08 1.24o/o Total Loss of ERCW 8.02E-09 0.69%

ISLOCA RHR PUMP SEAL INITIATOR FLAG 5.52E-09 0.47o/o SECONDARY BREAK OUTS DE CONTA NMENT SG 1 5.50E-09 0.47o/o SECONDARY BREAK OUTS DE CONTA NMENT SG 2 5.50E-09 0.47o/o SECONDARY BREAK OUTS DE CONTA NMENT SG 3 5.50E-09 0.47o/o SECONDARY BREAK OUTS DE CONTA NMENT SG 4 2.25E-09 0.19o/o Reactor Trip 1.63E-09 0.14%

Turbine Trip 1.25E-09 0.11%

Loss of Battery Board 4 1.24E-49 0.11%

Maior flood in the Turbine Buildinq 1.00E-09 0.09%

SLOCA ON COLD LEG 1 1.00E-09 0.09%

SLOCA ON COLD LEG 2 1.00E-09 0.09%

SLOCA ON COLD LEG 3 1.00E-09 0.09%

SLOCA ON COLD LEG 4 8.64E-10 0.07o/o lnadvertent Closure of 1 MSIV 8.46E-10 0.07o/o Partial Loss of Main Feedwater 7.91 E-10 0.07o/o Total Loss of Main Feedwater 4.58E-10 0.04o/o SG1 S THE FAULTED SG 4.58E-10 0.04o/o SG2 S THE FAULTED SG 4.58E-10 0.04o/o SG3 S THE FAULTED SG 4.58E-10 0.04o/o SG4 S THE FAULTED SG 4.56E-10 0.04o/o Loss of Condenser Vacuum 4.49E-10 0.04o/o

$praV event on dryers 1.16E-06 TOTAL

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WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ITEM RAW FV RRW BB u 1sYs082 80.05739 9.58E-02 L.LO720L 8.89E-05 u 1sYs030 zIL.35040 7.30E-O2 r.o7g76L 2.36E-O4 u1sYs003 L3.96679 7.r9E-02 L.O775L5 1.45E-05 u2sYso82 1.80328 L.97E-02 1.020113 9.24E-O7 U1SYSZLL L20L7.34000 r.44E-02 L.0L4643 1.35E-02 u2sYs030 1.65843 8.55E-03 1.00873 7.6LE-O7 u1sYso74 7L2.20L20 7.34E-03 1.007393 7.99E-04 ITEM RAW FV RRU1T BB U1SYSZLL L20L7.34000 L.44E-O2 L.OL4643 1.35E-02 u1sYs2L2 7924.94900 1.39E-03 1.001395 8.90E-03 u 1sYS053 I44L.94200 4.89E-04 1.000489 1.52E-03 u 1SYSO74 7r2.20I20 7.34E-O3 1.007393 7.99E-04 u0sYs23s 501.91080 7.07E-O4 r.ooo707 5.53E-04 uosYs067 249.79290 3.01E-03 1.003022 2.79E-O4 u 1sYs030 211.35040 7.30E-O2 L.07876L 2.36E-04 uosYs236 163.4L7IO 2.92E-O3 L.OO2927 1.82E-04 uosYS070 105.50940 4.37E-04 L.OOO437 L.L7E-O4 U1SYSO82 80.05739 9.68E-02 r.La720L 8.89E-05 U1SYSOTO 29.023L7 6.41E-04 1.000641 3.15E-05 u1sYS003 13.96579 7.L9E-02 L.0775L5 1.45E-05 u2sYs067 6.67699 1.59E-03 1.001595 5.39E-05 u 1sYso62 5.29104 2.42E-O3 L.002425 4.82E-06 u1sYso77 4.55049 8.81E-05 1.000009 4.00E-05 U1SYSO99 4.08577 1.33E-04 1.000133 3.47E-O6 U2SYSZLL 2.g1gg0 1.76E-03 1.001758 2.16E-05 uosYs226 2.90L82 3.34E-05 1.000003 2.L4E-O6 u 1sYs068 2.35287 3.43E-03 1.003439 1.52E-06 U1SYS2L4 2.06259 L.47E-O5 1.000015 1.19E-05

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page:230

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 96 -- Unit 2 System Impoftance for LERF, F-V > 0.5o6 Item RAW FV RRW BB U2SYSO82 81.59317 1.05E-01 L.LL7OgL 9.37E-05 u2sYs003 15.05L28 7.74E-O2 1.093996 1.54E-05 u2sYS030 231.30r20 7.67E-O2 1.093031 2.58E-04 u 1sYs082 1.95251 2.27E-O2 L.O232L6 1.14E-06 U2SYS2LL 3490.55400 1.51E-02 1.015294 4.05E-03 U1SYSO3O 1.82309 9.99E-03 1.01009 9.68E-07 u2sYso74 589.90580 7.09E-03 L.OO7L4 8.00E-04 Table 97 -- Unit 2 System lmportance for LERF, RAW > 2 Item RAW FV RRt,I/

BB U2SYS2L2 766L.27300 9.41E-04 1.000942 8.90E-03 U2SYSzLL 3490.55400 1.51E-02 1.015284 4.05E-03 U2SYSO53 1394.20900 4.70E-04 L.OOO47L 1.62E-03 UzSYSO74 589.90590 7.09E-03 L.OO7L4 8.00E-04 UOSYS06T 339.15940 3.34E-03 1.00335 3.93E-04 uosYS236 305.43730 2.01E-03 1.002019 3.55E-04 u2sYS030 231.30L20 7.67E-O2 1.083031 2.58E-04 U2SYSO82 81.59317 1.05E-01 L.LL7O9T 9.37E-05 u2sYS070 28.14010 6.67E-O4 1.000557 3.15E-05 U2SYSOO3 15.05L29 7.74E-02 1.083886 1.64E-05 u1SYSO67 10.08340 2.02E-03 1.002023 1.05E-05 U2SYS2L4 9.99492 L.29E-04 1.000129 1.04E-05 U2SYS062 5.L4077 2.33E-03 1.002339 4.81E-05 u2sYso77 4.95808 9.88E-06 1.00001 4.50E-05 u2sYS099 4.942L7 1.86E-04 1.000186 4.58E-05 U1SYS2IL 3.01141 2.04E-03 L.042047 2.34E-06 U2SYSO58 2.4L720 3.35E-03 1.003359 1.65E-06 u1SYSO70 2.00055 2.39E-04 1.000239 1.16E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:231

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

ltem RAW FV RRW BB WBN-I-PMP -003-0001A -S 7.07190 7.L7E-A2 L.0772L7 6.90E-06 WBN-I-GEN -082-0001A -A 4.48433 5.06E-02 1.053292 3.97E-05 WBN-I-GEN -082-00018 -B 4.38082 4.88E-02 L.05L276 3.85E-06 WBN-I-FAN -030-0459 -A 4.29452 L.97E-02 L.020047 3.72E-O6 WBN-I-FAN -030-0451 -B 4.19850 1.90E-02 L.0L9372 3.51E-06 WBN-I-FAN -030-0214 2.71042 9.49E-03 1.009595 1.93E-06 wBN-1-BKR -2LL-L7 16l L6 -A 3.68850 7.L2E-O3 L.007158 3.03E-06 wB N-I-BKR -2LL-L7 28/ L6 -B 3.61005 5.91E-03 1.006956 2.94E-O6

Calculation No. MDN-000-999-2008-0 1 51 Rev: 001 Plant: WBN Unit 0 Page:232

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 09 - Unit I Component lmportance for LERF, RAW > 2 Item RAW FV RRW BB wBN-o-cKV -057-05038 -A 98.3 L776 7.70E-05 L.OAOO77 1.09E-04 wBN-o-cKV -057-0503D -A 98.3 L776 7.7AE-05 r.oooo77 1.09E-04 wBN-o-cKV -057-0503F -B 95.58852 9.16E-05 1.000092 1.06E-04 wBN-o-cKV -067 -0503H -B 95.58852 9.16E-05 1.000092 1.06E-04 WBN.I-BD -211-A -A 68.377L4 7.O3E-04 1.000703 7.57E-05 WBN-I-STN -063-0200 32.57436 3.15E-04 1.000316 3.55E-05 WBN-I-OXF -2L2-A001 -A 22.77630 4.73E-04 1.000473 2.45E-05 WBN-I-BD -2I2-A001 -A 21.55190 2.L4E-04 1.000214 2.31E-05 wBN-I-BKR -2L2-A00U1B -A 20.44595 7.ggE-05 1.00009 2.19E-05 WBN-I-BKR -2L2.A1.A 20.44585 7.99E-05 1.00009 2.18E-05 WBN-I-OXF -2L2-A002 -A 14.56099 2.94E-04 1.000294 1.52E-05 WBN-I-BD -2I2-A002 -A L3.52227 1.30E-04 1.000131 1.41E-05 wBN-1-BKR -2L2-A002/1 B -A L2.0L756 4.52E-05 1.000045 1.24E-05 WBN-I-BKR -2L2-A2 -A L2.OL756 4.52E-05 1.000045 1.24E-05 WBN-I-PM P -003-0001A -S 7.07180 7.L7E-A2 L.O772L7 6.90E-05 wBN-o-cH G R-236-0001 -D 5.43857 5.41E-04 1.000542 4.99E-05 WBN-I.BD -211-B -B 4.7L669 3.90E-05 1.000039 4.L7E-O6 WBN-1-G EN -082-0001A -A 4.49433 5.06E-02 L.053292 3.97E-06 WBN-I-GEN -082-00018 -B 4.38082 4.88E-02 L.05L276 3.85E-06 WBN-I-FAN -030-04s9 -A 4.29452 r.97E-Oz L.020047 3.72E-06 WBN-I-BD -235-0001 -D 4.22105 2.2LE-04 L.OOOzzL 3.62E-06 WBN-I-FAN -030-0461 -B 4.19850 1.90E-02 r.o1tg372 3.61E-06 WBN-I-BKR -2LL-L7 L6l L6 -A 3.58850 7.L2E-03 L.0O7168 3.03E-05 wBN-1-BKR -2LL-L7 28 I L6 -B 3.61005 5.91E-03 1.005956 2.94E-06 WBN-I-XSW -235-0001 -D 3.47L44 7.06E-05 1.000071 2.79E-06 WBN-I-FCO -030-0443 -A 3.44655 2.59E-03 L.OO2597 2.75E-O6 WBN-1-FCO -030-0459 -A 3.44655 2.59E-03 L.OO2597 2.75E-O6 WBN-1-SW -235-0001 -D 3.43119 9.98E-06 1.00001 2.73E-06 WBN-I-FCO -030-044s -B 3.38591 2.53E-03 L.OO2532 2.69E-06 WBN-I-FCO -030-0461 -B 3.38591 2.53E-03 1.002532 2.68E-06 wB N -o-BKR -23 6-0 OOLI 226-D 3.20LL7 9.03E-06 1.000009 2.47E-06 wBN-o-sw -235-000usw1-s 3.20LL7 9.03E-05 1.000009 2.47E-06 wB N-o-BKR -23 6-0 OOLI 204-D 3.17391 8.96E-06 1.000009 2.44E-O6 WBN-0-BD -236-0001 -D 2.96367 2.70E-A4 L.OOO27 2.2LE-O6 wB N-o-F U -23 5-0 OOLI 210-D 2.90589 5.95E-06 1.000005 2.L4E-O6 WBN-I-FAN -030-02L4 2.7L042 9.49E-03 1.009585 1.93E-06 WBN-o-BD -236-0002 -E 2.6619r 1.93E-03 1.001935 1.87E-05 WBN-I-BKR -099-L LL6l LB -A 2.55954 5.14E-05 1.000051 1.86E-05 WBN-I-CKV -063-0586 -S 2.437L7 1.89E-05 1.000019 1.51E-05 WBN-1-CKV -063-0587 -S 2.437L7 1.89E-05 1.000019 1.61E-06

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:233

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Item WBN-I-CKV -063-0588 -S RAW 2.437L7 IV 1.89E-05 RRW 1.000019 BB 1.51E-05 WBN-I-CKV -053-0589 -S 2.437L7 1.89E-05 1.000019 1.51E-06 WBN-o-F U -23 5-0 OOLI 201-D 2.42493 4.47E-06 1.000004 1.50E-06 WBN-I-FAN -030-049L 2.4226L 3.83E-04 1.000393 1.50E-06 wBN-1-BKR -099-L LL6l LC -B 2.4L962 5.25E-05 1.000053 1.59E-06 WBN-I-FAN -030-0493 2.34064 3.51E-04 1.000351 1.51E-05 WBN-I-RFV -068-0553 2.33878 1.08E-03 1.00109 1.51E-06 WBN-I-RFV -058-0564 2.33879 1.08E-03 1.00109 1.51E-05 WBN-I-RFV -068-0565 2.33879 1.08E-03 1.00109 1.51E-05 WBN-I-BD -235-0002 -E 2.29729 L.O7E-O4 1.000107 1.46E-05 WBN-o-PMP -070-0051 -S 2.25472 3.58E-04 1.000359 1.41E-06 WBN-I-XSW -235-0002 -E 2.04009 3:29E-05 1.000033 1.17E-06 WBN-I-PS -003-0138A -A 2.03775 L.27E-O4 L.OOOL?7 1.17E-06 WBN-I-SW -235-0002 -E 2.O2rO7 4.19E-06 1.000004 1.15E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 234

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Itern RAW FV RRW BB WBN-2-PM P -003-0001A -S 10.50019 8.01E-02 L.087042 1.11E-05 WBN-2-GEN -082-00028 -B 4.73852 5.60E-02 1.059349 4.4LE-O6 WBN-2-GEN -082-0002A -A 4.48537 5.22E-02 1.055095 4.11E-06 WBN-2-FAN -030-0462 4.53442 2.L5E-02 t.021933 4.L3E-06 WBN-2-FAN -030-0460 4.28488 2.00E-02 1.020415 3.84E-06 WBN-2-FAN -030-02L4 2.66047 9.30E-03 1.009394 1.94E-05 wB N-2-BKR -2LL-L828 / L6 -B 3.89249 7.65E-03 I.OO77L4 3.37 E-06 WBN-2-BKR -2LL-L8L6 I L6 -A 3.69254 7.15E-03 L.007202 3.14E-05 WBN-2-FAN -030-0450 1.58915 5.12E-03 1.005146 8.07E-07 WBN-2-FAN -030-0454 1.58915 5.12E-03 1.005L46 8.07E-O7

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:235

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Item RATIl/

FV RRW BB wBN-o-cKV -067-0503F -B 101.45310 9.54E-05 1.000095 L.L7E-04 wBN-o-cKV -057-0503H -B 101.45310 9.54E-05 1.000095 L.L7E-O4 wBN-o-cKV -067 -05038 -A 9L.9L2L8 8.93E-05 1.000099 1.05E-04 wBN-o-cKV -067 -A503D -A 91.91218 8.93E-05 1.000089 1.06E-04 WBN-2-BD -211-A.A 53.86550 5.51E-04 1.000552 5.14E-05 WBN-2-STN -053-0200 31.53060 3.06E-04 1.000305 3.55E-05 WBN-2-OXF -2L2-A002 -A 14.40959 2.9LE-04 1.000291 1.55E-05 WBN-2-BD -2L2-A002 -A L3.29753 1.28E-04 1.000129 L.43E-05 WBN-2-B KR -2r2-AOO2I LB - A LL.78200 4.43E-05 1.000044 1.25E-05 WBN.2-BKR -2L2-A2.A LL.78200 4.43E-05 1.000044 1.25E-05 WBN-2-OXF -2L2-A001 -A 10.73059 2.LLE-O4 1.000211 1.13E-05 WBN-2-PM P -003-0001A -S 10.50019 8.01E-02 L.087042 1.11E-05 WBN-2-BD -2L2-AOO1 -A 9.98840 9.36E-05 1.000094 1.04E-05 WBN-2-MCC -2L4-A001 -A 9.65253 9.05E-05 1.00009 1.01E-05 WBN-2-BKR -2L2-A00 u1 B -A 9.4829L 3.48E-05 1.000035 9.85E-06 WBN-2-BKR -2L2-A1 -A 9.4829L 3.48E-05 1.000035 9.85E-06 w B N B K R -2L2-AOOLI LOB-A 9.31464 3.42E-05 1.000034 9.56E-06 wB N-2-B KR -2r4-AoOLI LA1-A 9.31464 3.42E-05 1.000034 9.66E-05 wBN-o-cHG R-235-0003 -F 5.20747 5.13E-04 1.000513 4.89E-06 WBN-2-GEN -082-00028 -B 4.73852 5.50E-02 1.059349 4.41E-05 WBN-2.BD -211-B -B 4.59876 3.78E-05 1.000038 4.18E-05 WBN-2-FAN -030-0462 4.53442 2.L5E-O2 1.021933 4.13E-06 WBN-2-G EN -082-0002A -A 4.48537 5.22E-02 1.055095 4.L1E-06 WBN-2-FAN -030-0450 4.28488 2.AOE-02 1.020415 3.84E-06 WBN-2-BKR -2LL-L8281 L6 -B 3.89249 7.65E-03 L.AO77L4 3.37E-06 WBN-2-BKR -2LL-r8 16/15 -A 3.69254 7.15E-03 L.007202 3.14E-06 WBN-2-FCO -030-0446 -B 3.62434 2.79E-03 L.0O2786 3.05E-06 WBN-2-FCO -030-0462 -B 3.62434 2.78E-O3 L.OO27g6 3.05E-06 WBN-2-FCO -030-0444 -A 3.43007 2.58E-03 1.002599 2.83E-06 WBN-2-FCO -030-0460 -A 3.43007 2.59E-03 1.002588 2.83E-05 wB N-o-B KR -23 6-0 OA3 I 226-F 3.L2926 8.74E-06 1.000009 2.47E-O6 wB N -o-sw -236-A003/SW 1-S 3.L2826 8.74E-06 1.000009 2.47E-06 WBN-2-BKR -099-L LL6l LB -A 3.10559 7.79E-O5 1.000079 2.45E-05 WBN-o-B KR -235-0003/30 4-F 3.03579 8.40E-06 1.000009 2.37E-06 WBN-o-FU -236-0AcB I 2L0-F 2.84277 5.75E-05 1.000005 2.L4E-O6 WBN-o-BD -236-0003 -F 2.93926 3.20E-06 1.000003 2.L4E-O6 WBN-2-BKR -099-L LL6l LC -B 2.92950 6.77E-05 1.000069 2.L2E-O6 WBN-2-FAN -030-02L4 2.66047 9.30E-03 1.009394 1.94E-06 WBN-2-FAN -030-0494 2.566L9 4.21E-04 1.000421 1.82E-06 WBN-2-FAN -030-0492 2.43595 3.88E-04 1.000399 1.67E-05

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 236

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Item WBN-2-CKV -053-0586 -S RAW 2.38990 FV 1.93E-05 RRW 1.000019 BB 1.51E-05 WBN-2-CKV -053-0587 -S 2.38990 1.83E-05 1.000019 1.61E-05 WBN-2-CKV -053-0588 -S 2.38990 1.83E-05 1.000019 1.61E-05 WBN-2-CKV -053-0589 -S 2.3ggg0 1.83E-05 1.000019 1.51E-05 WBN-0-FU -236-0003/30 l-F 2.37769 4.32E-06 1.000004 1.60E-05 WBN-2-RFV -058-0553 2.2669L 1.02E-03 1.001022 L.47E-06 WBN-2-RFV -068-0554 2.2669L 1.02E-03 L.OOLOzz L.47E-06 WBN-2-RFV -058-0s6s 2.2669L 1.02E-03 L.OOLOza L.47E-06 WBN-o-BD -236-0004 -G 2.L9243 2.O7E-06 1.000002 1.39E-06 WBN-0-PMP -070-0051 -S 2.00055 2.34E-04 1.000234 1.16E-06

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:237

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 102 -- lJnlt I HRA LERF lmportance F;V >0.5yo Event Name Probabilltv FtI BB RRW RA}U Descriptio_!

HARRl 3.80E-03 4.35E-02 1.29E-05 1.0455 L2.4L38 Align high pressure recirculatioh, given auto swapover works HAAFl 2.20E-O2 3.33E-02 1.70E-05 L.0344 2.4803 Locally operate TD AFW valves to control flow on SBO AFWOP3 1.10E-02 2s6E-O2 3.02E-05 1.0305 3.5616 Depressurize/cooldown to low pressure injection following small LOCA with failur HAOSBF 2.00E-01 2.34E-O2 L.32E-O7 L.O24 r.0937 Steam generator feed with manual level control fails ssroP 5.70E-03 1.83E-02 3.05E-05 1.0195 3.7098 Terminate Safety lnjection to prevent PORV water challenge HACHl 1.10E-02 L.52E-O2 L.55E-05 1.0154 2.3il3 Transfer Containment Spray to Sump (RHR Swap Successful)

HAMU28 5.00E-03 1.35E-02 3.05E-06 1.0138 3.7L28 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 1.35E-02 3.05E-05 1.0138 3.7L28 Makeup to RWST using containment spray test recirc from sump during small LOCA HACCSR2 1.60E-02 1.34E-02 9.38E-07 1.0135 L.822 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HAHHl 2.30E-03 1.01E-02 4.92E-06 1.0102 5.37L3 Place Hydrogen igniters in service HAMU2 2.00E-02 7.29E-O3 4.L0E-07 1.0073 1.3573 Makeup to RWST during IS LOCA HAMU2 2.00E-02 7.29E-O3 4.LOE-O7 1.0073 1.3573 Makeup to RWST during IS LOCA

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 238

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 103 -- lJnit I HRA LERF lmportance RAW > 2 Event Name Probabilitv Fv BB

.RRTI, RAW Description WHESDB 1 2.00E-06 1.06E-04 5.97E-05 1.0001 54.1481 5.9kV Shutdown Board 1-A Automatic Features Disabled WHESUM 3.50E-07 1.05E-05 3.39E-05 L

3r.2L78 Remove Drain Plugs from Refueling Canal After Refueling HARRl 3.80E-03 4.35E-02 1,29E-05 1.0455 L2.4L38 Align high pressure recirculatior, given auto swapover works HAHHl 2.30E-03 1.01E-02 4.92E-05 r.oLoz 5.37L3 Place Hydrogen igniters in service HACIl L.70E-04 6.79E-O4 4.49E-06 1.0007 4.9935 Backup Containment Isolation, Given Loss of All AC Power HAMUzB 5.00E-03 1.35E-02 3.06E-06 1.0138 3.7L28 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU28 5.00E-03 1.35E-02 3.06E-05 1.0138 3.7L28 Makeup to RWST using containment spray test recirc from sump during small LOCA ssroP 5.70E-03 1.83E-02 3.05E-06 1.0186 3.7099 Terminate Safety lnjection to prevent PORV water challenge AFWOP3 1.10E-02 2.96E-O2 3.02E-06 1.0305 3.5615 Depressu rize/cooldown to low pressure injection following small LOCA with failur DHARR3 1.00E-03 2.52E-03 2.83E-05 1.0025 3.5191 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCULATION HAAFl 2.20E-O2 3.33E-02 1.70E-06 L.O344 2.4803 Locally operate TD AFW valves to control flow on SBO WHESDB 2 2.00E-05 2.77E-O6 1.55E-06 L

2.385 6.9kV Shutdown Board 1-B Automatic Features Disabled HACHl 1.10E-02 L.52E-O2 1.55E-06 1.0154 2.3643 Transfer Containment Spray to Sump (RHR Swap Successful)

HTPRl 1.70E-03 1.96E-03 1.29E-06 1.002 2.L495 Start TD AFW pump and control LCVs during LOSP (fails to start initially)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 239

Subject:

WBN PROBABILISTIC RISKASSESSMENT -

SUMMARY

Table 104 -- lJnit 2 HRA LERF Inrpofiance F-V >0.570 Euent Name Probabilltv FU BB RRUf RAW Description HAAFl 2.20E-02 4.67E-O2 2.47E-06 L.O49 3.O77 Locally operate TD AFW valves to control flow on SBO HARRl 3.80E-03 4.21E-02 1.29E-05 1.0439 12.0301 Align high pressure recirculatior, given auto swapover works AFWOP3 L.10E-02 2s0E-O2 3.05E-05 1.0299 3.6073 Depressu rizelcooldown to low pressure injection following small LOCA with failur HAOSBF 2.00E-01 2.29E-O2 1.33E-O7 L.0234 1.0916 Steam generator feed with manual level control fails SSIOP 6.70E-03 L.74E-02 3.03E-05 L.OL78 3.5866 Terminate Safety lnjection to prevent PORV water challenge HACHl 1.10E-02 L.46E-O2 1.55E-06 1.0149 2.3L57 Transfer Containment Spray to Sump (RHR Swap Successful)

HAMU2B 5.00E-03 L.32E-O2 3.05E-06 1.0133 3.6201 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMUzB 5.00E-03 I.32E-O2 3.06E-06 1.0133 3.6201 Makeup to RWST using containment spray test recirc from sump during small LOCA HACCSR2 1.50E-02 L.25E-O2 9.06E-07 L.OL26 L.7672 ALIGN AND INITIATE ALTERNATE COOLING TO CCP A HAHHl 2.30E-03 1.05E-02 5.29E-06 1.0106 5.5415 Place Hydrogen igniters in service HAERCW3 5.00E-02 9.47E-O3 2.20E-O7 1.0096 1.18 OPERATOR FAILS TO ALIGN FIRE PROTECTION TO CCP A HAMU2 2.00E-02 7.05E-03 4.LOE-O7 1.0071 1.3455 Makeup to RWST during IS LOCA HAMU2 2.OOE-Oa 7.05E-03 4.LOE-O7 1.0071 1.3455 Makeup to RWST during IS LOCA

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:240

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 105 -- lJnalz HRA LERF Euent Name Probability R'

BB RRW RAW Descripffipn WHESDB 3 2.00E-05 8.44E-05 4.90E-05 1.0001 43.L796 5.9kV Shutdown Board z-AAutomatic Features Disabled WHESUM 3.50E-07 1.02E-05 3.39E-05 1

30.2188 Remove Drain Plugs from Refueling Canal After Refueling HARRl 3.80E-03 4.2rE-02 1.29E-05 1.0439 12.0301 Align high pressure recirculatioh, given auto swapover works HAHHl 2.30E-03 1.05E-02 5.29E-06 L.0106 5.5415 Place Hydrogen igniters in service HACIl L.70E-O4 7.33E-04 5.01E-06 1.0007 5.3085 Backup Containment Isolation, Given Loss of All AC Power HAMUzB 5.00E-03 1.32E-02 3.05E-06 1.0133 3.5201 Makeup to RWST using containment spray test recirc from sump during small LOCA HAMU2B 5.00E-03 L.32E-O2 3.05E-06 L.0133 3.620L Makeup to RWST using containment spray test recirc from sump during small LOCA AFWOP3 1.10E-02 2.90E-02 3.06E-06 L.0299 3.6073 Depressurize/cooldown to low pressure injection following small LOCA with failur SSIOP 6.70E-03 r.74E-02 3.03E-05 r.oL78 3.5866 Terminate Safety lnjection to prevent PORV water challenge DHARR3 1.00E-03 2.43E-03 2.83E-05 L.OO24 3.4324 OPERATOR FAILS TO RESTART RHR PUMP FOR HP RECIRCULATION HAAFl 2.20E-O2 4.67E-02 2.47E-06 L.O49 3.O77 Locally operate TD AFW valves to control flow on SBO HTPRl 1.70E-03 2.58E-03 L.77E-06 1.0026 2.5L78 Start TD AFW pump and control LCVs during LOSP (fails to start initially)

WHESDB 4 2.00E-06 2.68E-06 1.56E-05 1

23402 6.9kV Shutdown Board 2-B Automatic Features Disabled HACHl 1.10E-02 L.46E-O2 1.55E-06 1.0149 2.3L57 Transfer Containment Spray to Sump (RHR Swap Successful)

I Calculation No. MDN-000-999-2OO8O r--'--'-"-""-"-'-'-'ltt"r I subject WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

I Table 106 -- lJnit I Basic Event LERF Event Name Probability RI BB RRU' RAW Deecfiption PAF 9.14E-01 1.00E+00 1.23E-06 8E+08 1.0941 P IANT AVAI LAB I LITY FACTO R PTSF11PMP OO3OO1AS 1.05E-02 6.2LE-O2 6.68E-06 1.0653 6.8848 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1 1AS RCPSEALlS2 2.08E-01 5.18E-02 2.80E-O7 1.0545 L.L978 RCP SEAL L82 GPM FL-BATDEP 1.00E+00 5.07E-02 5.69E-08 1.0534 T

Battery Depleted FLAG xsBo11 6.62E-01 3.06E-02 5.19E-08 1.0315 1.0156 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) GR DGGFRTGEN O821A-A L.24E-02 2.9LE-O2 2.64E-06 1.03 3.3235 DG 1A-A FAILS TO RUN DGGFR1GEN 0821B-B L.24E-O2 2.80E-02 2.54E-06 1.0299 3.2301 DG 1B.B FAILS TO RUN xsBo10 7.06E-01 2.63E-02 4.19E-08 L.427 1.011 SUMMER 2.00E-01 2.L5E-O2 I.2LE-O7 L.O2l9 1.0859 SUMMER SEASON DGGFD1GEN O821A.A 7.15E-03 2.L5E-O2 3.37E-06 1.0219 3.9809 DG 1A-A FAILS TO START AND RUN FIRST HOUR DGGFD1GEN 08218-8 7.L5E-03 2.08E-02 3.27E-O6 1.0213 3.8907 DG 1B-B FAILS TO START AND RUN FIRST HOUR xsBo17 5.52E-01 L.87E-Oz 3.17E-08 1.0191 1.0095 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) GR xsBo16 7.06E-01 1.61E-02 2.55E-08 1.0163 1.0067 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) PC FNSFD1FAN 030459 4.80E-03 L.4LE-O2 3.29E-05 1.0143 3.9155 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR FNSFD1FAN 030451 4.80E-03 1.36E-02 3.19E-05 1.0138 3.8275 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR MORFO1FCV 06700067 9.70E-04 r.34E-O2 1.56E-05 1.0136 14.838 3

Added for evaluation WBN-2-10-135 and WBN-2 0005 MORFO1FCV 05700065 9.70E-04 L.34E-O2 L.55E-05 1.0135 L4.765 5

Added for evaluation WBN-2-10-135 and WBN-2 0005 xsBo14 4.59E-02 L.2LE-O2 2.96E-O7 L.OL22 L.25L Recovery Sequence 7 (Common Cause of DG to Start)

GR

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:242

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 106 -- lJnit I Basic Event LERF lmportance F-V >0.570 Euent Name Probability Rf BB RRW RAW Description xsBo13 5.50E-02 1.18E-02 2.38E-O7 L.OLz L.1997 Recovery Sequence 7 (Common Cause of DG to Start)

PC CBLLKICBK 00000001 1.11E-03 1.05E-Oz 1.07E-05 1.0107 10.491 2

CONTAINMENT BUILDING LARGE PRE-EXISTING LEAK

>=2" PTSFR1PMP OO3OO1AS 1.51E-03 9.54E-03 6.65E-06 1.0095 6.9215 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS SEQFDlA-A 3.33E-03 9.49E-03 3.20E-05 1.0095 3.8393 SEQUENCER 1A-A FAILS (Unknown UNID)

SEQFDlB-B 3.33E-03 9.20E-03 3.10E-05 1.0093 3.7535 SEQUENCER 1B-B FAIIS (Unknown UNID) xsBo12 9.31E-01 8.51E-03 1.04E-08 1.0087 1.0005 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) Wl cB KFO 1 B KR_ZLLL7 L6 I L6-A 2.55E-03 7.L2E-O3 3.14E-05 L.OO72 3.7838 WB N-1-B KR-2 LL-L7 L6/ L6-A B R EAKE R FAI LS TO O P E N xsBo15 L.37E-OL 6.92E-03 5.57E-08 L.OO7 1.0435 Recovery Sequence 7 (Common Cause of DG to Start)

WI cB KF O 1 B K R_ILLL7 28 / L6-B 2.55E-03 5.91E-03 3.04E-06 L.OO7 3.70L9 WBN-1-BKR-2LL-L728(L6B BREAKER FATLS TO OPEN FL-ATWS 1.00E+00 5.96E-03 6.69E-09 1.005 1

ATWS DGGFR2GEN 0822A-A L.24E-O2 5.84E-03 5.29E-O7 1.0059 1.4655 DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR FNSFR1FAN 030459 2.66E-03 5.59E-03 2.35E-05 1.0055 3.093 EXHAUST FAN 1-FAN-30-459 FAILS TO RUN DGGFR2GEN 08228-8 L.24E-O2 5.42E-03 4.9LE-O7 1.0054 L.432L DG 2B-B FATLS FArLs TO RUN (WBN-2-GEN -082-00028 -

B)

FNSFRI.FAN 030451 2.66E-03 5.37E-03 2.26E-06 1.0054 3.0089 EXHAUST FAN 1-FAN-30-461 FAILS TO RUN xsBo18 9.31E-01 5.15E-03 6.21E-09 1.0052 1.0004 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) Wl Note: this table does not inc ude CCF, HEPs, or T&M

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:243

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 1OT -- fJnit I Basic Event LERF Impoftance RAW > 2 Euent Name PrpbabiliW R'

BB RRUU RAW Description cRr 1,20E-06 2.O3E-03 1.89E-03 1.002 L687.875 CONTROL RODS FAIL TO INSERT cKRRrocKV 06705038 7.LOE-O7 6.91E-05 1.09E-04 1.0001 98.2995 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE wBN-0-67-5038 CKRRIOCKV O57O5O3D 7.LOE-O7 5.91E-05 1.09E-04 1.0001 98.2995 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE wBN-0-67-s03D cKRRrocKV 0670503F 7.LOE-O7 6.72E-O5 1.06E-04 1.0001 95.5079 DISCHARGE CHECK VALVE 5O3F GROSS REVERSE LEAKAGE WBN-O-57.503F CKRRIoCKV 0570503H 7.LOE-O7 6.72E-05 1.06E-04 1.0001 95.6079 DISCHARGE CHECK VALVE 5O3H GROSS REVERSE LEAKAGE WBN-O-57-503H BUSFRlBD 211A.A 1.04E-05 7.O3E-04 7.58E-05 1.0007 68.45L7 WBN-1-BD-211-A SHUTDOWN BOARD FAILS SMPPS1STN SUMP2 1.00E-05 3.16E-04 3.55E-05 1.0003 32.5998 SUMP SUCTION STRAINERS PLUGGED (GENERAL)

XRFFR1OXF zLzAL-A 2.L7E-Os 4.73E-04 2.45E-05 1.0005 22.8L 5.9KV TO 48OV TRANSFORMER 1A1-A (xFMR 1A1-A)

BUSFRlBD zLzAL-A 1.04E-05 2.L4E-O4 2.3LE-05 1.0002 2L.582 48OV SHUTDOWN BOARD TA1.A BUS AVAILABLE (WBN-I-BD -2L2-A001 -A)

CBKXO1BKR zLzAL-A 4.10E-06 7.99E-05 2.19E-05 1.0001 20.4722 6.9KV SUPPLY TO TRANSFORMER 1A-A

( 1-BKR -2L2-A1-A) TRANSF E RS OPEN cBKXOIBKR_ZLaALlLB-A 4.10E-05 7.99E-05 2.19E-05 1.0001 20.4722 TRANSFORMER OUTPUT TO 48OV SDBD 1A1-A

( I-BKR -ZL}-AL( LB-A) TRANSFE RS O p E N MORFO1FCV 05700067 9.70E-04 L.34E-02 1.56E-05 1.0135 14.8393 Added for evaluation WBN-2-10-135 and WBN-2 0005 MORFO1FCV 06700066 9.70E-04 1.34E-02 1.55E-05 1.0135 L4.7656 Added for evaluation WBN-2-L0-135 and WBN-2 0005 XRFFR1OXF 2L2A2-A 2.L7E-Os 2.94E-O4 1.52E-05 1.0003 14.5539 WBN-1-OXF.2 L2-A2-A TRANSFORMER FAILS DURI NG OPERATION

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:244

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 107 -- fJnit I Basic Event LERF Importance RAW > 2 Event Name ProbabiliW FU BB RRW RAW Description BUSFRlBD 2L2A2-A 1.04E-05 1.30E-04 1.41E-05 1.0001 13.5251 WBN-1-BD-212.A002-ASWITCH BOARD FAI LS DURI NG OPERATION CBKXO1BKR 2L21A-A 4.10E-06 4.52E-05 1.24E-05 L

12.0193 WBN-l-BKR-2 L2-A2-A BREAKER TRANSFERS OP E N cBKXOIBKR_2L2A2(13-A 4.10E-06 4.52E-05 1.24E-05 1

L2.OL93 w B N B K R-2 L2-A2/ 1 B-A B R EAKE R TRAN S F E RS O p E N CBLLKICBK 00000001 1.11E-03 L.05E-02 1.07E-05 r.oLo7 LO.4912 CONTAINMENT BUILDING LARGE PRE-EXISTING LEAK

>=2t' PTSFR1PMP OO3OO1AS 1.51E-03 9.54E-03 5.55E-05 1.0095 6.92L5 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS PTSF11PMP OO3OO1AS 1.05E-02 6.2LE-O2 6.68E-06 1.0663 5.8848 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-I.

3-LA5 U1 L2 CFEs 1.00E-02 5.52E-O2 6.31E-05 1.0595 5.5643 CFEs - LOW PRESSURE, VB, IGN AND ARFS SUCCESSFUL BCH FROCH RG2361-D L.22E-O4 5.41E-04 4.99E-05 1.0005 5.4399 WBN-O-CH RG.235-OOO1-D BATTERY CHARGER FAI LS U1 L2 PISGTRSBO 3.25E-O2 1.45E-01 5.00E-05 1.1691 5.3057 Pr-sGTR (SBO SEQUENCE)

U1 L2 TISGTRSBO 8.57E-Oz 3.72E-OL 4.88E-06 1.593 4.97L6 Tr-sGTR (SBO SEQUENCE)

BUSFROBDL 2351-D 8.68E-05 3.43E-05 4.43E-05 L

4.9459 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MTSSTON TlME (20 HOURS)

U1 L2 DET 1.00E-03 3.87E-03 4.35E-05 1.0039 4.8647 CONTAINMENT FAILS EARLY DUE TO H2 DETONATION BUSFRlBD 2118-B 1.04E-05 3.90E-05 4.20E-05 L

4.7422 SHUTDOWN BOARD 1B-B FATLS (1-BD-211-B-B)

U1 L2 CFES 5.00E-02 1.68E-01 3.77E-O6 L.20L4 4.L845 CFES - LOW PRESSURE, VB, IGN AND ARFS FAILED BUSFRlBD 2351-D 1.04E-05 3.30E-05 3.55E-05 L

4.L7L9 12OV AC VITAL INST POWER BOARD 1-I FAILS 74-1-R 1.20E-03 3.62E-03 3.39E-06 1.0036 4.0118 MOV Fgt-74-1 RUPTURES (ANNUALTZED EXPOSURE) 74-9-R 1.20E-03 3.52E-03 3.39E-06 1.0035 4.0118 RUPTURE OF Fgt-74-9 (ANNUALTZED EXPOSURE)

DGGFD1GEN 0821A-A 7.15E-03 2.L5E-O2 3.37E-06 L.O2L9 3.9809 DG 1.A-A FAILS TO START AND RUN FIRST HOUR FNSFD1FAN 030459 4.80E-03 L.4LE-O2 3.29E-06 1.0143 3.9155 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR DGGFD1GEN 0821B-B 7.15E-03 2.08E-02 3.27E-O6 L.O2L3 3.8907 DG 1B-B FAILS TO START AND RUN FIRST HOUR SEQFDlA-A 3.33E-03 9.49E-03 3.20E-05 1.0095 3.8393 SEQUENCER LA-A FAILS (Unknown UNID)

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:245

Subject:

WBN PROBABILISTIG RISK ASSESSMENT -

SUMMARY

Table 107 - Unit { Easic Event LERF lmportance RAW > 2 Euent filame Prcbabilitv Rf BB RRW RAW Descrtption FNSFD1FAN 030461 4.80E-03 1.36E-02 3.19E-05 1.0138 3.8275 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR c B K FO 1 B KR_zLLL7 L6 I L6-A 2.55E-03 7.L2E-O3 3.14E-06 L.OO72 3.7838 W B N B K R-2 LL-L7 L6 I L6-A B R EA K E R FA I LS TO O P E N SEQFDlB-B 3.33E-03 9.20E-03 3.10E-05 1.0093 3.7535 SEQUENCER 1B-B FAILS (Unknown UNID) cB K FO 1 B KR_zLLL7 28 I L6-B 2.55E-03 6.91E-03 3.04E-06 1.007 3.70L9 WBN-1-BKR-2LL-L728/L6B BREAKER FATLS TO OPEN DAOFO1FCO 030443 L.02E-03 2.59E-03 2.85E-05 1.0025 3.537L SUPPLY DAMPER 1-FCO-30.443 OPENS DAOFO1FCO 030459 L.02E-03 2.59E-03 2.85E-05 1.0026 3.5371 EXHAUST FAN DAMPER 1-FCO-30.459 FAILS TO OPEN DAOFOTFCO 030445 1.02E-03 2.53E-03 2.78E-06 1.0025 3.4736 SUPPLY DAMPER 1-FCO-30.445 OPENS DAOFO1FCO 030451 1.02E-03 2.53E-03 2.78E-O6 1.0025 3.4736 EXHAUST FAN DAMPER 1.FCO.30.461 FAILS TO OPEN MORFO2FCV 05700067 9.70E-04 2.39E-03 2.77E-06 L.OO24 3.464 Added for evaluation WBN-2-10-135 and WBN-2 0005 cBKXOISW 23s1-D 4.10E-06 9.98E-05 2.73E-06 1

3.43L2 Disconnect Switch in 120V AC Vita! Inst Power Board 1-l CBKXOIXSW 2351-D 4.10E-05 9.99E-05 2.73E-05 L

3.4312 Transfer Switch in 120V AC Vital lnst Power Board 1-l DGGFR1GEN 0821A-A L.24E-O2 2SLE-OZ 2.64E-46 1.03 3.3235 DG 1A-A FAILS TO RUN DGGFR1GEN 08218-8 L.24E-O2 2.80E-02 2.54E-05 1.0288 3.230L DG 1B.B FAILS TO RUN cBKXOoBKR_236L1226-D 4.10E-06 9.03E-06 2.47E-O6 L

3.2015 Normal Supply Breaker 226 from 125V Vital Batt Chgr L

cBKXO0SW_236L/SW1-S 4.10E-05 9.03E-06 2.47E-O6 L

3.2015 480V AC Vital Disconnect Pane! 1 Switch 0-SW-236-OOOLISWI-S Tra nsfers Open cBKXOoBKR_236L/204-D 4.10E-05 8.95E-05 2.45E-06 1

3.1841 125VDC SUPPLY BREAKER TO 6.9KV SDBD 1A-A BUSFROBDL 2362-E 8.58E-05 1.83E-05 2.35E-05 L

3. L029 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MTSSTON TrME (20 HOURS)

FNSFR1FAN 030459 2.65E-03 5.59E-03 2.36E-06 1.0055 3.093 EXHAUST FAN 1-FAN-30-459 FAILS TO RUN FNSFR1FAN 030461 2.55E-03 5.37E-03 2.26E-06 1.0054 3.0089 EXHAUST FAN 1-FAN-30-461 FAILS TO RUN FUSFP0FU_236L1210-D 3.12E-05 5.95E-05 2.L4E-06 1

2.9062 SUPPLY BREAKER MAIN LINE FUSEzLO BUSFROBD 2351-D L.74E-06 3.31E-06 2.L4E-06 1

2.9045 Failure of 125V DC Battery Board 1

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:246

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 107 - Unit I Basic Event LERF lmportance RAW > 2 Errent Jtlame Pmbability FU BB RRW RAW Description FNSFR1FAN O3OOO2L4 2.65E-03 4.65E-03 1.96E-06 L.OO47 2.7406 DC EMERGENCY EXHAUST FAN FAILS TO RUN AFTER 1ST HOUR WBN-1-30-2L4 74-2-D 4.288-44 7.30E-04 1.92E-06 1.0007 2.7054 MOV Fgl-74-2 FAILS ON DEMAND (D= 2 DEMANDS/YR) Mult *2 74-8-D 2.L4E-O4 3.65E-04 1.91E-06 1.0004 2.7043 MOV Fgl-74-8 FAILS ON DEMAND (D= 1 DEMANDSAR) Mult *2 74-2-R 1.80E-03 3.07E-03 1.92E-05 1.0031 2.703L MOV Fgl-74-2 RUPTURES (T = 1.5) 74-8-R 1.80E-03 3.07E-03 1.92E-06 1.0031, 2.703L MOV Fgl-74-8 RUPTURES (T=1.5)

RTBFO1RTB O99OOOOA 3.70E-05 5.L4E-05 1.86E-06 1.0001 2.5595 WBN-I-B KR-099-111 6l rB-A REACTO R TRr p B REAKE R TRAIN A FAILS FANFR1FAN 030491 2.59E-04 3.83E-04 1.66E-06 1.0004 2.4766 DG 1A-A ROOM ELEC PANEL ICOMBUSTTON AtR FAN (wBN-1-FAN-30-4eu cKcFolcKV 0630058b 1.30E-05 1.88E-05 1.63E-06 L

2.4477 WBN-1-CKV-053-0586-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 05300587 1.30E-05 1.88E-05 1.53E-05 L

2.4477 WBN-1.CKV-053-0587-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 06300588 1.30E-05 1.88E-05 1.63E-05 L

2.4477 WBN-1-CKV-063.0588-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFolcKV 05300589 1.30E-05 1.88E-05 1.53E-05 L

2.4477 WBN-1-CIO/-063-0589-S CHECK VALVE FA!LS TO OPEN ON DEMAND FUSFP0FU_236L1201-D 3.12E-05 4.47E-O6 1.51E-06 1

2.43L8 125VDC SUPPLY FUSE aOL BUSFR2BD 2118.8 1.04E-05 1.49E-05 1.61E-05 L

2.4299 WBN.2-BD-211-B-B SWITCHBOARD FAILS DURING OPERATION RTBFO1RTB O99OOOOB 3.70E-05 5.25E-05 1.59E-06 1.0001 2.4L96 WBN-1-BKR-099.111 6I LC-B REACTOR TRI P BREAKER TRAIN B FAILS FANFR1FAN 030493 2.59E-04 3.51E-04 1.56E-06 1.0004 2.3905 DG L8-8 ROOM ELEC PANEL ICOMBUSTTON AtR FAN (wBN-1-FAN-30-493)

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 247

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 107 -- lJnit I B*sl*:Event LERF lmportance RAW > 2 Euent Name Prcbability R'

BB RRIfrI RAW Description SRVSR1SRV 05800553 7.95E-04 1.08E-03 1.52E-06 1.0011 2.3555 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-1-58-563 SRVSR1SRV 06800564 7.95E-04 1.08E-03 1.52E-06 1.0011 2.3555 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-1-58-564 SRVSR1SRV 06800565 7.95E-04 1.08E-03 1.52E-05 1.0011 2.3555 SAFEW VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-1-68-565 BUSFRlBD 2352-E 1.04E-05 1.33E-05 1.43E-05 L

2.2729 120V AC VrTAL 1-rr BUS FAILS (WBN-I-BD -235-0002 -

E)

BUSFROBD 2362-E L.74E-O6 2.14E-06 1.39E-06 1

2.2334 Failure of 125V DC Battery BoardZ MOCFO1FCV 00100051 1.86E-04 2.LLE-O4 L.27E-06 1.0002 2.L329 Motor operated valve fails to open (clean water)

SWPFDlPS OO3O138A L.L7E-O4 L.27 E-04 L.22E-O6 1.0001 2.0884 PRESSURE SWITCH WBN-1-PS-3-138A FAI LS cBKXOtSW 2352-E 4.10E-05 4.19E-05 1.15E-06 1

2.O2L2 Disconnect Switch in 120V AC Vital lnst Power Board 1-!r (WBN-I-SW -?3s-0002 -E)

CBKXOIXSW 2352-E 4.10E-06 4.19E-05 1.15E-06 L

2.O2L2 Transfer Switch inl fZ0V AC Vital lnst Power Board 1-ll (1-XSW-23s-0002-E)

FNSFD1FAN O3OOO2L4 4.80E-03 4.84E-03 1.13E-05 1.0049 2.OO45 DC EMERG EXHAUST FAN FAILS TO START AND RUN FOR 1ST HOUR WBN-1-30-2L4 Note: this table does not inc ude CCF, HEPs, or T&M

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SUMMARY

Table 108 -- llnit 2 Basic Event LERF lmportance F-V >0.506 Euent ilame Probabilitr R'

BB RRW EAUTI Dercription PAF 9.14E-01 1.00E+00 L.278-06 7E+08 1.0941 PLANT AVA! LABI LIW FACTOR PTSFL2PMP 003001A5 1.05E-02

6. t9E-02 5.88E-06 1.065 5.8619 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-1.

3-1AS RCPSEAL1S2 2.08E-01 5.85E-02 3.28E-07 L.O62L L.2235 RCP SEAL L82 GPM FL-BATDEP 1.00E+00 4.86E-02 5.65E-08 1.0511 1

Battery Depleted FLAG DGGFRzGEN 08228-8 L.24E-02 3.29E-O2 3,08E-05 L.034 3.62L7 DG 2B-B FAlLS FAILS TO RUN (WBN-2-GEN -082-00028 -B)

DGGFR2GEN 0822A-A L.24E-02 3.05E-02 2.85E-06 1.0315 3.4338 DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR xsBo11 6.62E-01 2.78E-O2 4.88E-08 1.0285 L.OL42 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) GR xsBo10 7.05E-01 2.39E-02 3.94E-08 L.0245 1.0L Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) PC SUMMER 2.00E-01 2.32E-02 1.35E-07 1.0238 1.0929 SUMMER SEASON DGGFD2GEN 0822B-B 7.15E-03 2.3LE-O2 3.76E-06 L.0237 4.2L52 DIESEL GENERATOR FAILS TO START AND RUN FIRST HOUR (WBN-2-GEN -082-OOO2B -B)

DGGFD2GEN 0822A-A 7.15E-03 2.L7E-Oz 3.53E-05 L.0222 4.Ot4 DIESEL GENERATOR 2A-A FAILS TO START AND RUN FIRST HOUR xsBo17 6.62E-0L 1.59E-02 2.97E-O&

L.OL72 1.0095 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) GR PTSFR2PMP OO3OO1A5 1.61E-03 1.53E-Oz 1.10E-05 1.0155 10.4809 PUMP FAILS AFTER 1 HOUR WBN-2-3-1AS FNSFD2FAN 030462 4.80E-03 L.52E-O2 3.67E-06 1.0154 4.L423 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR xsBo15 7.06E-01 1.45E-Oz 2.39E-08 L.OL47 1,.0061 Recovery Sequence 8 (Common Cause of DG to Start AND TDAWF Fails to Start) PC FNSFD2FAN 030460 4.80E-03 L.42E-02 3.43E-06 L.OL44 3.942L BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR

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Subject:

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SUMMARY

Table {08

  • Unit 2 BaCi*.Event LERF lmportance F-V >0.5yo Euent Name Probability FY BB RRW
  • AW Descriptien MORFO2FCV 06700057 9.70E-04 1.34E-02 1.61E-05 1.0136 14.8139 Added for evaluation WBN-2-10-135 and WBN-2 0006 MORFO2FCV 06700065 9.70E-O4 L.29E-O2 1.54E-05 1.013 L4.2565 Added for evaluation WBN-2-L0-135 and WBN-2 0005 xsBo14 4.59E-02 1.19E-02 3.O2E-07 L,OLZL L.2479 Recovery Sequence 7 (Common Cause of DG to Start)

GR xsBo13 5.50E-02 L.L7E-Oz 2.43E-07 1.0118 L.L972 Recovery Sequence 7 (Common Cause of DG to Start)

PC CBLLK2CBK 00000001 1.11E-03 1.08E-02 1.13E-05 1.011 L0.7528 CONTAINMENT BUILDING LARGE PRE-EXISTING LEAK

>=2" SEQFD2B-B 3.33E-03 L.O2E-O2 3.57E-05 1.0103 4.0596 SEQUENCER 2B-B FAILS (Unknown UNID)

SEQFDzA-A 3.33E-03 9.55E-03 3.33E-06 1.0096 3.859 SEQUENCER 2A-A FAILS (Unknown UNID)

FL-ATWS 1.00E+00 8.88E-03 1.03E-08 1.009 1

ATWS xsBo12 9.31E-01 7.85E-03 9.80E-09 1.0079 1.0006 Recovery Sequence 4 (DG A And B Fail to Start And TDAFW Fails to Start) Wl c B K F O 2 B K R_ 2LLL828 / L'-B 2.55E-03 7.65E-03 3.49E-06 L.OO77 3.9941 5.9KV SDBD BREAKER 1828 FAILS TO OPEN DGGFR1GEN 08218-8 L.248-02 7.42E-O3 5.95E-07 1.0075 1.5919 DG 1B-B FAILS TO RUN c B KF O 2 B KR_2LLL8L6 I L6-A 2.55E-03 7.15E-03 3.26E-06 L.OO72 3.797 6.9KV SDBD BREAKER 1816 FAILS TO OPEN xsBo15 L.37E-01 5.84E-03 5.80E-08 1.0069 1.0431 Recovery Sequence 7 (Common Cause of DG to Start)

WI U2 OBLOCK 7.50E-01 6.74E-O3 1.04E-08 1.0058 L.OO22 Probability that 0 PORVs are blocked FNSFR2FAN 030462 2.55E-03 6.31E-03 2.75E-O6 1.0053 3.3508 EXHAUST FAN 2-FAN.3O-462 FAILS TO RUN FNSFR2FAN O3O45O 2.55E-03 5.82E-03 2.54E-06 1.0058 3.L773 EXHAUST FAN 2-FAN-30-450 FAILS TO RUN DGGFR1GEN O821A.A L.24E-O2 5.52E-03 5.18E-07 1,0055 L.4403 DG 1A-A FAILS TO RUN Note: this table does not include CCF, HEPs, or T&M

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 250

Subject:

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SUMMARY

Table 109 - Unit 2 Basic Event LERF lmportance RAW > 2 Event Name Probabilnty R/

BB EEW RAW Description cR!

1.20E-05 2.85E-03 2.76E-O3 1.0029 2374.6L4 CONTROL RODS FAIL TO INSERT cKRRrocKV 0570503F 7.LOE-07 7.L3E-05 L.L7E-O4 1.0001 LOL.3725 DISCHARGE CHECK VALVE 5O3F GROSS REVERSE LEAKAGE WBN-O-57-503F cKRRrocKV 0670503H 7.LOE-07 7.L3E-05 L.L7E-04 1.0001 L0L3725 DISCHARGE CHECK VALVE 5O3H GROSS REVERSE LEAKAGE WBN-O-67-503H cKRRrocKV 0670s038 7.LOE-O7 5.45E-05 1.05E-04 1.0001 91.8295 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE wBN-0-57-5038 cKRRrocKV 0570s03D 7.LOE-O7 6.45E-05 1.05E-04 1.0001 91.8296 DISCHARGE CHECK VALVE GROSS REVERSE LEAKAGE wBN-0-57-503D BUSFR2BD 211A-A 1.04E-05 5.51E-04 5.15E-05 1.0006 53.9413 SHUTDOWN BOARD 2A-A FATLS (2-BD-21I.-A-A)

SMPPS2STN SUMPz 1.00E-05 3.06E-04 3.55E-05 1.0003 31.5551 suMP sucTroN STRATNERS PLUGGED (GENERAL)

MORFO2FCV 06700067 9.70E-04 L34E-O2 1.51E-05 1.0135 14.8139 Added for evaluation WBN-2-10-135 and WBN-2 0005 XRFFR2OXF 2L2A2-A 2.L7E-05 2SLE-O4 1.56E-05 1.0003 L4.4LL5 6.9kV l 480V TRANSFORM ER 2A2A (2-OXF -2L2-A002-A)

MORFO2FCV 05700056 9.70E-04 L.29E-02 1.54E-05 1.013 L4.2565 Added for evaluation WBN-2-10-135 and WBN-2 0006 BUSFR2BD 2L2A2-A 1.04E-05 L.28E-O4 L.43E-05 1.0001 13.3001 48OV SHUTDOWN BOARD 2A2-A BUS FAILS TO OPERATE CBKXO2BKR 2L2A2-A 4.10E-06 4.43E-05 1.25E-05 1

TT.784L 6.9KV SUPPLY TO 2A2A (2-BKR -2L2-A2-A) TRANSF E RS O P E N cBKXO2BKR_2L2A2/LB-A 4.10E-06 4.43E-05 1.25E-05 L

LL.784L 48OV SDBD aA}-ASUPPLY BREAKER (2-BKR -2L2-A2l LB-A) TRANSFE RS O p EN CBLLK2CBK 00000001 1.11E-03 1.08E-02 1.13E-05 1.011 L0.7528 CONTAINMENT BUILDING LARGE PRE-EXISTING LEAK

>=2t' XRFFR2OXF zLzAL-A 2.L7E-Os 2,LLE-04 L.13E-05 1.0002 L0.7307 5.9kV TO 480V TRANSFORMER 1A1-A (XFMR 2A1-A)

PTSFR2PMP OO3OO1AS 1.51E-03 1.53E-02 1.10E-05 1.0155 10.4809 PUMP FAILS AFTER 1 HOUR WBN-2.3-1.AS

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SUMMARY

Table {09 -- Unit 2 Easi.E.Ercnt LERF lmportance R/AW > 2 Euent Name Prubability FU BB ERW RAW Description BUSFRzBD zLzAL-A 1.04E-05 9.36E-05 1.04E-05 1.0001 9.9887 48OV SHUTDOWN BOARD 2A1.A FAILS TO OPERATE BUSFR2MCC zL4AL-A 1.04E-05 9.05E-05 1.01E-05 1.0001 9.6886 48OVAC CONT & AUX BLDG VENT BOARD 2-M CC-2L4-A001-A (2A1-A) FAILS TO RUN CBKXO2BKR zLzAL-A 4.10E-05 3.48E-05 9.85E-05 1

9.4832 5.9KV SUPPLY TO TRANSFORMER 2A1A (2-BKR-2L2-A1-A) cBKXO2BKR_ZLZALlLB-A 4.10E-06 3.48E-05 9.85E-05 1

9.4832 48OV SDBD 2A1-A SUPPLY BREAKER TRANSFERS oPEN (WBN-2-BKR -2L2-A001/1B -A) c B KXO 2 B K R_ LLLALI 10 B-A 4.10E-06 3.42E-05 9.59E-06 1

9.3391 48OV SDBD FDR BKR TO C&A BLD VENT BOARD 2A1-A (2-BKR-2L2-AU10B-A) cB KXO 2 B KR_ LL4AL( LAL-A 4.10E-05 3.42E-05 9.59E-06 L

9.3391 su PPLY BREAKER 2-BKR-2 14-A00 LIaAL-A TRANSFERS OPEN PTSFLZPMP OO3OO1AS 1.05E-02 6.19E-02 5.88E-05 1.065 5.8519 PUMP FAILS TO START AND RUN FOR 1 HOUR WBN-I-3-1AS U2 L2 CFEs 1.00E-02 5.85E-02 6.79E-06 L.O62L 6.79 CFEs - LOW PRESSURE, VB, IGN AND ARFS SUCCESSFUL U2 L2 PISGTRSBO 3.25E-O2 L,44E-OL 5.14E-06 1.158 5.2823 Pr-sGTR (SBO SEQUENCE)

BCH FROCH RG2363-F r.22E-O4 5.13E-04 4.89E-06 1.0005 5.2081 CHARGER III FAILS DURING OPERATION (o-cH RG-236-0003/F)

U2 L2 TISGTRSBO 8.57E-02 3.71E-01 5.03E-06 L.5891 4.9552 Tr-sGTR (SBO SEQUENCE)

U2 L2 DET 1.00E-03 3.83E-03 4.45E-05 1.0038 4.8254 CONTAINMENT FAILS EARLY DUE TO H2DETONATION BUSFROBDL 2363-F 8.68E-06 3.28E-05 4.39E-06 1

4.7792 BUS FAlls TO OPERATE OVER REMAINDER OF 24 HOUR MTSSTON TlME (20 HOURS)

BUSFR2BD 211B-B 1.04E-05 3.78E-05 4.2LE-O6 1

4.6266 WBN-2-BD-211-B-B SWITCHBOARD FAILS DURING OPERATION DGGFD2GEN O822B.B 7.15E-03 2.3LE-02 3.76E-06 L.0237 4.2L52 DIESEL GENERATOR FAILS TO START AND RUN FIRST HOUR (WBN-2-GEN -082-OOO2B -B)

U2 L2 CFES 5.00E-02 1.66E-01 3.87E-06 L.L997 4.1631 CFES - LOW PRESSURE, VB, IGN AND ARFS FAILED

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:252

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SUMMARY

Table 109 -- tlnit 2 Basic Event LERF lmportance RAW > 2 Euent Name Probability ru BB RRW RAW Description FNSFD2FAN 030452 4.80E-03 L.52E-02 3.67E-06 1.0154 4.L423 BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR SEQFD2B-B 3.33E-03 L.O2E-O2 3.57E-06 1.0103 4.0595 SEQUENCER 2B-B FAILS (Unknown UNID)

DGGFD2GEN 0822A-A 7.15E-03 2.L7E-Oz 3.53E-05 L.0222 4.OL4 DIESEL GENERATOR 2A-A FAILS TO START AND RUN FIRST HOUR c B K F O 2 B K R_ 2LLL828 I L6-B 2.55E-03 7.65E-03 3.49E-05 L.OO77 3.9941 6.9KV SDBD BREAKER 1828 FAILS TO OPEN FNSFD2FAN 030460 4.80E-03 L.42E-O2 3.43E-05 L.OL44 3.942L BOARD ROOM EXHAUST FAN FAILS TO START OR RUN FIRST HOUR u2 74-L-R 1.20E-03 3.50E-03 3.39E-06 1.0035 3.9L7 MOV FCV-74-1 RUPTURES (ANNUALTZED EXPOSURE) u2 74-9-R 1.20E-03 3.50E-03 3.39E-06 L.0035 3.9L7 RUPTURE OF Fgt-74-9 (ANNUALTZED EXPOSURE)

SEQFD2A-A 3.33E-03 9.55E-03 3.33E-06 1.0096 3.859 SEQUENCER 2A-A FAILS (Unknown UNID) cB K FO 2 B KR_2LLL8L6 l L6-A 2.55E-03 7.15E-03 3.26E-06 L.OO72 3.797 6.9KV SDBD BREAKER 1815 FAILS TO OPEN MORFO1FCV 06700067 9.70E-04 2.65E-03 3.19E-06 L.OO27 3.7392 Added for evaluation WBN-2-L0-135 and WBN-2 0006 DAOFO2FCO 030446 1.02E-03 2.78E-O3 3.15E-06 1.0028 3.7208 SUPPLY DAMPER 2-FCO-30-445 OPENS DAOFOZFCO 030462 1.02E-03 2.78E-O3

3. L6E-06 1.0028 3.7208 EXHAUST FAN DAMPER 2-FCO-3O-462 FAILS TO OPEN DGGFR2GEN O822B.B L.24E-02 3.29E-O2 3.08E-06 1.034 3.62L7 DG 2B-B FAILS FATLS TO RUN (WBN-2-GEN -082-00028 -B)

I DAOFO2FCO 030444 1.02E-03 2.58E-03 2.94E-O6 L.0025 3.5281 SUPPLY DAMPER 2-FCO-30-444 OPENS DAOFO2FCO 030460 1.02E-03 2.58E-03 2.94E-06 1.0026 3.5281 EXHAUST FAN DAMPER 2-FCO-30-460 FAILS TO OPEN DGGFR2GEN 0822A-A r.24E-O2 3.05E-02 2.86E-05 1.0315 3.4338 DIESEL GENERATOR FAILS TO RUN AFTER FIRST HOUR FNSFR2FAN 030462 2.66E-03 6.31E-03 2.75E-06 1.0063 3.3609 EXHAUST FAN 2-FAN-30-462 FAILS TO RUN FNSFR2FAN 030460 2.65E-03 5.82E-03 2.54E-O6 1.0058 3.L773 EXHAUST FAN 2-FAN-30-460 FAILS TO RUN cBKXOoBKR_23631226-F 4.10E-06 8.74E-06 2.47E-O6 L

3.L287 Normal Supply Breaker 226 from 125V Vital Batt Chgr 3

cBKXO0SW_236315W1-S 4.10E-06 8.74E-05 2.47E-06 L

3.L287 480V AC Vita! Disconnect Panel lll Switch 0-SW-236-0003/SW1-S Transfers Open

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:253

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SUMMARY

Table 109 -- fJnit 2 Basic Event LERF lmportance RAW > 2 Event Name PrubabiliW FV BB RRW RAW Description RTBFO2RTB O99OOOOA 3.70E-05 7.79E-05 2.45E-06 1.0001 3.1055 WBN-2-BKR-099-111 6l LB-A REACTOR TRrp BREAKER TRAIN A FAILS cBKXOBKR_23631304-F 4.10E-06 8.40E-05 2.38E-05 1

3.0468 L25V DC SUPPLY BREAKER TRANSFERS OPEN BUSFROBDL 2364-G 8.58E-05 L.72E-05 2.30E-06 1

2.9802 BUS FAILS TO OPERATE OVER REMAINDER OF 24 HOUR MTSSTON TlME (20 HOURS)

FUSFP0FU_2363/210-F

3. L2E-05 5.75E-06 2.L4E-O6 1

2.8432 SUPPLY BREAKER MAIN LINE FUSE 210 BUSFROBD 2363-F L.74E-06 3.20E-05 2.L4E-O6 1

2.84L6 Failure of 125V DC Battery Board 3 RTBFO2RTB O99OOOOB 3.70E-05 6.77E-Os 2.LzE-06 1.0001 2.8285 WBN-2-BKR-099-111 6l LC-B REACTOR TRr p BREAKER TRAIN B FAILS FNSFRzFAN O3OOO2T4 2.55E-03 4.54E-03 1.98E-05 1.0045 2.7006 DC EMERGENCY EXHAUST FAN FAILS TO RUN AFTER 1ST HOUR WBN 3O-2L4 u2 74-2-D 4.28E-O4 7.O7 E-04 1.92E-06 1.0007 2.65LL MOV Fgt-74-2 FAILS ON DEMAND (D= 2 DEMANDS/YR) Mult *2 u2 74-2-R 1.80E-03 2.97E-O3 1.92E-05 1.003 2.6497 MOV Fgl-74-2 RUPTURES (T = 1.5) u2 74-8-R 1.80E-03 2.97E-O3 1.92E-05 1.003 2.6497 MOV Fgl-74-8 RUPTURES (T=1.5) u2 74-8-D 2.L4E-O4 3.53E-04 1.91E-05 1.0004 2.6479 MOV Fgl-74-8 FAILS ON DEMAND (D= 1 DEMANDS/YR) Mult *2 FANFRzFAN 030494 2.59E-04 4.21E-04 L.89E-05 1.0004 2.6244 DG 2B-B ROOM ELEC PANEL / COMBUSTTON AtR FAN (wBN-2-FAN-30-494)

BUSFRlBD 2118-B 1.04E-05 1.51E-05 1.80E-06 1

2.5458 SHUTDOWN BOARD 1B-B FAILS (1-BD-211-B-B)

FANFR2FAN 030492 2.59E-04 3.88E-04 L.74E-O6 1.0004 2.4953 DG 2A-A ROOM ELEC PANEL /COMBUSTTON AtR FAN (wBN-2-FAN-30-492) cKcFo2cKV 0630058b 1.30E-05 1.82E-05 1.53E-05 1

2.3998 WBN-2-CKV-063-0585-S CHECK VALVE FAILS TO OPEN ON DEMAND cKcFo2cKV 06300587 1.30E-05 1.82E-05 1.63E-06 1

2.3999 WBN-2.CKV-063.0587.S CHECK VALVE FAIIS TO OPEN ON DEMAND cKcFo2cKV 05300588 1.30E-05 1.82E-05 1.53E-06 L

2.3ggg WBN-2-CKV-063-0588-S CHECK VALVE FAILS TO OPEN ON DEMAND

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:254

Subject:

WBN PROBABILISTIC RISK ASSESSMENT -

SUMMARY

Table 109 -- fJnit 2 Basic Event LERF lrnportance RAW > 2 Event Name PrubabiliW FU BB RRW RAW Deecription cKcFo2cKV 06300589 1.30E-05 1.82E-05 1.53E-05 1

2.3998 WBN.2-CKV-063-0589-S CHECK VALVE FAILS TO OPEN ON DEMAND FUSFP0FU_23631301-F 3.12E-06 4.32E-06 1.51E-05 1

2.3845 125VDC SUPPLY FUSE O-235-3/3OL-F SRVSR2SRV 06800553 7,95E-04 1.02E-03 1.49E-05 1.001 2.2829 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-2-68-563 SRVSR2SRV 05800564 7.95E-04 1.02E-03 L.49E-06 1.001 2.2829 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-2-68-s54 SRVSR2SRV 05800565 7.95E-04 1.02E-03 1.49E-05 1.001 2.2829 SAFETY VALVE FAILS TO RESEAT AFTER STEAM RELIEF wBN-2-68-565 BUSFROBD 2364-G L.74E-06 2.O7E-O6 1.39E-06 1

2.L926 Failure of 125V DC Battery Board 4 MOCFO2FCV 001000s1 1.85E-04 2.O4E-O4 L.27E-O6 1.0002 2.095 Motor operated valve fails to open (clean water)

SwPFD2PS 0030138A L.L7E-04 L.23E-04 L.22E-O6 1.0001 2.0524 PRESSURE SWITCH WBN-2-PS-3-138A FAI LS Note: this table does not include CCF, HEPs, or T&M

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:255

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SUMMARY

Table l1'0r,;- Unit {,r,jIoet and llaintenanoe tERF,lmportauce F{,>0.SoZo Euent Hame Pnrbabilfiy R'

BB RRW RAW Description MTM 1PMPOO3OO1AS 8.52E-03 3.35E-02 4.42E-06 L.O347 4.8983 PUMP WBN-1.3-1AS IN MAINTENANCE MTM 1GEN O821A.A 1.10E-02 1.98E-02 2.02E-05 L.0202 2.7774 DIESEL 1A-A MAINTENANCE MTM 1GEN 0821B-B L.22E-O2 1.95E-02 1.80E-06 1.0199 2.5818 DIESEL 1B-B MAINTENANCE MTM PMPOMDPOSTA 6.52E-04 7.39E-03 L.27E-05 L.OO74 L2.326 ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM 2GEN 0822A-A 1.51E-02 6.30E-03 4.69E-O7 1.0053 L,4LLL DIESEL 2A-A MAINTENANCE

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 256

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SUMMARY

Table il{ - Unit I Test and talntenange LERFrlmportance RAW > 2 Euent Name Probabilitrf FI' BB RRW RAW Description MTM PMPOMDPO6TA 6.52E-04 7.39E-03 L.27E-Os L.OO74 L2.326 ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM PMPOMDPOSTB 2.83E-05 L.37E-O4 5.44E-05 1.0001 5.8439 ERCW PUMP TRAIN B UNAVAILABLE DUE TO MAINTENANCE MTM 1PMPOO3OO1AS 8.52E-03 3.35E-02 4.42E-O6 L.0347 4.8983 PUMP WBN-1.3-1AS IN MAINTENANCE TTM 1PTSOO3OO1AS 8.49E-04 3.00E-03 3.97E-06 1.003 4.5269 PUMP WBN-1-3-1AS IN TESTING MTM 1GEN 0821A-A L.10E-02 1.98E-02 2.O2E-O6 L.4202 2.7774 DIESEL 1.A-A MAINTENANCE MTM 1GEN 08218-8 L.22E-O2 1.95E-02 1.80E-06 1.0199 2.5818 DIESEL 1B.B MAINTENANCE MTM OCHRGz-E 2.20E-03 3.10E-03 1.58E-06 1.0031 2.4054 1.25VDC CHARGER II MAINTENANCE TTM 1GEN 0821A-A 2.36E-04 2.55E-04 L.22E-O6 1.0003 2.0832 DIESEL 1.A-A TESTING

Calculation No. MDN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page:257

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SUMMARY

Table 112 - Untt 2 Test and llaintenance LERF lmportance F-V >0.5%

Errcnt Name Probability FI' BB RRW RAW Description MTM 2PMPOO3OO1AS 8.52E-03 3.25E-O2 4.43E-05 1.0335 4.783L PUMP WBN-2-3-LAS IN MAINTENANCE MTM 2GEN 0822A-A 1.51E-02 2.83E-02 2.18E-05 L.O29L 2.8449 DIESEL 2A-A MAINTENANCE MTM 2GEN 08228-8 L.O7E-02 1.86E-02 2.O2E-O6 1.0189 2.7L8 DIESEL 2B-B MAINTENANCE MTM PMPOMDPO6TA 6.52E-04 6.25E-03 1.11E-05 1.0053 10.575 ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM 1GEN 0821B-B L.22E-02 5.92E-03 5.64E-07 1.006 1,4794 DIESEL 1B-B MAINTENANCE

Calculation No. M DN-000-999-2008-01 51 Rev: 001 Plant: WBN Unit 0 Page: 258

Subject:

WBN PROBABILISTIG RISK ASSESSMENT -

SUMMARY

Table 113 -- lJn it zTest and l$il,ntenance LERF lmportance RAW > 2 Event Name Probability FV BB RRW RAW Description MTM PMPOMDPOSTA 5.52E-04 5.25E-03 1.11E-05 1.0053 10.576 ERCW TRAIN A UNAVAILABLE DUE TO MAINTENANCE MTM 2MCC ZL4AL-A 2.15E-04 r.72E-O3 9.28E-05 1.0017 8.9828 480VAC C&A VB 2A1-A (2-M CC-214-A001-A)

MAINTENANCE MTM PMPOMDPOSTB 2.83E-05 2.05E-04 8.40E-06 1.0002 8.2316 ERCW PUMP TRAIN B UNAVAILABLE DUE TO MAINTENANCE MTM 2PMPOO3OO1AS 8.52E-03 3.25E-O2 4.43E-06 1.0335 4.783L PUMP WBN-2-3-LAS IN MAINTENANCE TTM 2PTSOO3OO1AS 8.49E-04 2.90E-03 3.97E-05 1.0029 4.4L38 PUMP WBN 3-LAS IN TESTING MTM 2GEN 0822A-A 1.51E-02 2.83E-O2 2.18E-06 L.O29L 2.8449 DIESEL 2A-A MA! NTENANCE TTM 2GEN 0822A-A 3.04E-04 5.47E-O4 2.09E-06 1.0005 2.7978 DIESEL 2A-A TESTING MTM 2GEN O822B.B L.O7E-Oz 1.86E-02 2.02E-O6 1.0189 2.7L8 DIESEL 2B.B MAI NTENANCE TTM-2GEN-08228-B 1.92E-04 2.99E-04 1.81E-05 1.0003 2.5592 DIESEL 2B-B TESTING

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